If you're concerned, you're feeling worried. When your clumsy friend announces his plans to become a stunt double, you should be concerned for his safety, and if you're not, you're a lousy friend.

The adjective concerned has roots in Latin terms for seeing clearly, as well as for being in relation to something. If you feel concerned, say for your neighbor who just bet his savings on a horse race, that's because you truly care for his well-being and you see that he's doing something stupid. Sometimes we use concerned to show the limits of our investment. As far as you are concerned, Madame X can jump off a cliff! You don't care!

Definitions of concerned
  1. adjective
    feeling or showing worry or solicitude
    concerned parents of youthful offenders”
    “was concerned about the future”
    “we feel concerned about accomplishing the task at hand”
    “greatly concerned not to disappoint a small child”
    (often followed by `to') giving care or attention
    filled with regret or concern; used often to soften an unpleasant statement
    feeling worry or concern or insecurity
    haunted, obsessed, preoccupied, taken up
    having or showing excessive or compulsive concern with something
    full of anxiety and concern
    characterized by or indicative of distress or affliction or danger or need
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    lacking in interest or care or feeling
    marked by lack of attention or consideration or forethought or thoroughness; not careful
    nonchalantly unconcerned
    lacking or showing a lack of due concern
    casual, insouciant, nonchalant
    marked by blithe unconcern
    degage, detached, uninvolved
    showing lack of emotional involvement
    showing no care or concern in attitude or action
    not beset by troubles or disturbance or distress
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  2. adjective
    involved in or affected by or having a claim to or share in
    “a memorandum to those concerned
    “an enterprise in which three men are concerned
    “factors concerned in the rise and fall of epidemics”
    synonyms: interested
    connected by participation or association or use
  3. adjective
    culpably involved
    “all those concerned in the bribery case have been identified”
    synonyms: complicit, implicated
    connected by participation or association or use
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