WordWeb Online

1. 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";
   - interested
    
2. 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"
    
3. Culpably involved
   "all those concerned in the bribery case have been identified";
   - implicated

1. Be relevant to
   - refer, pertain, relate, come to, bear on, touch, touch on, have to do with
    
2. Be on the mind of
   - interest, occupy, worry

See also: afraid, attentive, 'fraid [non-standard], haunted, involved, obsessed, preoccupied, solicitous, taken up, troubled

Antonym: unconcerned

Encyclopedia: Concerned