Synonyms for Concerned:

adj.

all (adjective)
interested.
attentive (adjective)
Immersed, intent, responsible, engrossed, vigilant, interested, attentive, observant, careful, sharp, fascinated, regardful, enraptured, heedful, alert, mindful, Considering, observing, Scrutinizing, diligent, watchful, Concentrating, absorbed, cautious, rapt, entranced, Hearkening.
involved with (adjective)
affected, active, interested, solicitous, attentive, implicated.
worried (adjective)
distressed, anxious, upset, solicitous, troubled, uneasy.

n.

in connection with something, in/with regard to, concern, about, regarding, devoted, as for, affected, in relation to, concerning. complicit, distressed, engaged, unsettled, nervous, in the process of doing something, submerged, be harnessed to, agitated, feelings, serious, active, actively, uneasy, anxious. worried, tense, troubled, frightened, on edge, upset, alarmed. attention span, attention, fixated, under someone's critical eye, focused, regard. concerned (noun)
haunted, afraid, implicated, interested, related to, preoccupied, involved, obsessed, related, taken up, solicitous.

Other synonyms:

submerged, engaged, attention, affected, concerning, attention span, devoted, focused, regarding, complicit, actively, anxious, distressed. about, nervous, serious, agitated, uneasy. regard, unsettled. active. involved
involved.
troubled
worried.
worried
troubled.
Other relevant words:
unsettled, regard, preoccupied, upset, engaged, active, solicitous, affected, nervous, actively, complicit, on edge, about, involved, attention, troubled, related, anxious, devoted, taken up, regarding, serious, distressed, alarmed, concerning, afraid, tense, agitated, concern, obsessed, uneasy, frightened, haunted, worried, implicated.

Usage examples for concerned

  1. They're much concerned about the bairns. – Between You and Me by Sir Harry Lauder
  2. Tell me, why are you concerned in this? – The Dragon's Secret by Augusta Huiell Seaman
  3. I'm rather poor as far as cash is concerned – Miss Pat at Artemis Lodge by Pemberton Ginther