active

Something that is active is characterized by movement and action. That action might be a random or temporary movement, such as someone who is active and exercises only now and then, or something continuous, like an active strain of a virus.

Since the adjective active suggests activity, applying it to anything implies some sort of motion or action. A person might be physically active, not sitting around and doing nothing, or mentally active, working the mind. In language, we refer to "the active voice" as one in which the subject does the action, in contrast to the passive voice, a rather boring style where the subject is the receiver of the action. Even in writing, it’s better to be active!

Definitions of active
  1. adjective
    characterized by energetic activity
    “an active toddler”
    active as a gazelle”
    “an active man is a man of action”
    Synonyms:
    about, astir
    on the move
    acrobatic, athletic, gymnastic
    vigorously active
    agile, nimble, quick, spry
    moving quickly and lightly
    hot
    marked by excited activity
    hyperactive, overactive
    more active than normal
    on the go
    (of a person) very busy and active
    sporty
    appropriate for sport or engagement in a sport
    lively
    full of life and energy
    energetic
    possessing or exerting or displaying energy
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    Antonyms:
    inactive
    not active physically or mentally
    desk-bound, deskbound
    restricted to working in an office rather than in an active physical capacity
    abeyant, dormant
    inactive but capable of becoming active
    hypoactive, underactive
    abnormally inactive
    inert, sluggish, soggy, torpid
    slow and apathetic
    sedentary
    requiring sitting or little activity
    lethargic, unenergetic
    deficient in alertness or activity
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  2. adjective
    taking part in an activity
    “an active member of the club”
    “he was politically active
    synonyms: participating
    involved
    connected by participation or association or use
  3. adjective
    engaged in or ready for military or naval operations
    “on active duty”
    synonyms: combat-ready, fighting
    operational
    (military) of or intended for or involved in military operations
  4. adjective
    engaged in full-time work
    active duty”
    “though past retirement age he is still active in his profession”
    Synonyms:
    activated
    (military) set up and placed on active assignment
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    Antonyms:
    inactive
    not engaged in full-time work
    off
    not performing or scheduled for duties
    retired
    no longer active in your work or profession
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  5. adjective
    (of the sun) characterized by an increased occurrence of sunspots and flares and radio emissions
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    Antonyms:
    quiet
    of the sun characterized by a low level of surface phenomena like sunspots e.g.
  6. adjective
    (of e.g. volcanos) capable of erupting
    Synonyms:
    alive, live
    capable of erupting
    live
    exerting force or containing energy
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    Antonyms:
    extinct
    (of e.g. volcanos) permanently inactive
    dead
    physically inactive
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  7. adjective
    (of e.g. volcanos) erupting or liable to erupt
    active volcanos”
    Synonyms:
    eruptive
    actively spewing out lava
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    Antonyms:
    dormant, inactive
    (of e.g. volcanos) not erupting and not extinct
    quiescent
    being quiet or still or inactive
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  8. noun
    a person who is a participating member of an organization
    “the club issues a list of members, both the actives and the retirees”
  9. adjective
    exerting influence or producing a change or effect
    “an active ingredient”
    Synonyms:
    activated
    rendered active; e.g. rendered radioactive or luminescent or photosensitive or conductive
    counteractive
    opposing or neutralizing or mitigating an effect by contrary action
    surface-active
    capable of lowering the surface tension of a liquid; used especially of detergents
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    Antonyms:
    inactive
    not exerting influence or change
    quiescent
    not active or activated
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  10. adjective
    disposed to take action or effectuate change
    “a director who takes an active interest in corporate operations”
    “an active antagonism”
    “he was active in drawing attention to their grievances”
    Synonyms:
    activist, activistic
    advocating or engaged in activism
    hands-on
    involving active participation
    proactive
    (of a policy or person or action) controlling a situation by causing something to happen rather than waiting to respond to it after it happens
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    Antonyms:
    inactive, passive
    lacking in energy or will
    hands-off
    not involving participation or intervention
    resistless, supine, unresisting
    offering no resistance
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  11. adjective
    tending to become more severe or wider in scope
    active tuberculosis”
    Synonyms:
    progressive
    advancing in severity
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    Antonyms:
    inactive
    (pathology) not progressing or increasing; or progressing slowly
    dead-end
    lacking opportunities for development or advancement
    flat
    commercially inactive
    indolent
    (of tumors, e.g.) slow to heal or develop and usually painless
    latent
    (pathology) not presently active
    quiescent
    (pathology) causing no symptoms
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  12. noun
    chemical agent capable of activity
    synonyms: active agent
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    type of:
    chemical agent
    an agent that produces chemical reactions
  13. adjective
    (used of verbs (e.g. `to run') and participial adjectives (e.g. `running' in `running water')) expressing action rather than a state of being
    synonyms: dynamic
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    Antonyms:
    stative
    ( used of verbs (e.g. `be' or `own') and most participial adjectives) expressing existence or a state rather than an action
  14. adjective
    expressing that the subject of the sentence has the semantic function of actor: "Hemingway favors active constructions"
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    Antonyms:
    passive
    expressing that the subject of the sentence is the patient of the action denoted by the verb
  15. noun
    the voice used to indicate that the grammatical subject of the verb is performing the action or causing the happening denoted by the verb
    “`The boy threw the ball' uses the active voice”
    synonyms: active voice
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    Antonyms:
    passive, passive voice
    the voice used to indicate that the grammatical subject of the verb is the recipient (not the source) of the action denoted by the verb
    type of:
    voice
    (linguistics) the grammatical relation (active or passive) of the grammatical subject of a verb to the action that the verb denotes
  16. adjective
    full of activity or engaged in continuous activity
    “an active seaport”
    “an active bond market”
    “an active account”
    Synonyms:
    brisk
    very active
    bustling
    full of energetic and noisy activity
    busy
    crowded with or characterized by much activity
    going
    in full operation
    open
    ready for business
    springy
    (of movements) light and confidently active
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    Antonyms:
    inactive
    lacking activity; lying idle or unused
    dark
    not giving performances; closed
    dead
    devoid of activity
    dull, slow, sluggish
    (of business) not active or brisk
    idle, unused
    not in active use
    strikebound
    closed or immobilized by a strike
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  17. adjective
    in operation
    “an active tradition”
    synonyms: alive
    existent, existing
    having existence or being or actuality
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