careless

When you're careless about something, you're not giving it much attention or consideration. If you're careless about mowing the lawn, you might mow over your mother's prized daffodils without even noticing.

When you say, "I couldn't care less" about something, you're probably going to be pretty careless about it, too. If you couldn’t care less about your homework, then you'll approach it in a careless manner, without much thought or concentration. Careless is negative, but it’s a little less so when it means effortless and unstudied, the way you might bat away a bug with a careless swat. Interestingly, the root meaning of care is "grief," so careless is "without grief."

Definitions of careless
  1. adjective
    marked by lack of attention or consideration or forethought or thoroughness; not careful
    careless about her clothes”
    “forgotten by some careless person”
    “a careless housekeeper”
    careless proofreading”
    “it was a careless mistake”
    “hurt by a careless remark”
    Synonyms:
    inattentive
    showing a lack of attention or care
    casual, cursory, passing, perfunctory
    hasty and without attention to detail; not thorough
    haphazard, slapdash, slipshod, sloppy
    marked by great carelessness
    heedless, reckless
    characterized by careless unconcern
    incautious
    carelessly failing to exercise proper caution
    offhand, offhanded
    casually thoughtless or inconsiderate
    incautious
    lacking in caution
    unconcerned
    lacking in interest or care or feeling
    negligent
    characterized by neglect and undue lack of concern
    superficial
    concerned with or comprehending only what is apparent or obvious; not deep or penetrating emotionally or intellectually
    imprudent
    not prudent or wise
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    Antonyms:
    careful
    exercising caution or showing care or attention
    blow-by-blow
    providing great detail
    certain, sure
    exercising or taking care great enough to bring assurance
    close
    rigorously attentive; strict and thorough
    conscientious, painstaking, scrupulous
    characterized by extreme care and great effort
    detailed, elaborate, elaborated
    developed or executed with care and in minute detail
    minute, narrow
    characterized by painstaking care and detailed examination
    overcareful, too-careful
    excessively or unduly careful
    particular
    providing specific details or circumstances
    protective
    (usually followed by `of') solicitously caring or mindful
    studious
    marked by care and effort
    thorough
    painstakingly careful and accurate
    cautious
    showing careful forethought
    diligent
    characterized by care and perseverance in carrying out tasks
    prudent
    careful and sensible; marked by sound judgment
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  2. adjective
    (usually followed by `of') without due thought or consideration
    careless of the consequences”
    synonyms: regardless
    heedless, unheeding
    marked by or paying little heed or attention
  3. adjective
    effortless and unstudied
    “an impression of careless elegance”
    “danced with careless grace”
    Synonyms:
    artless
    simple and natural; without cunning or deceit
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