Collocations for concerned - adj.

be, feel, look, seem, sound
become, get, grow
remain

extremely, fairly, very, etc.
deeply, especially, genuinely, gravely, greatly, particularly, seriously, terribly
increasingly
a little, slightly, etc.
(not) overly, (not) unduly
She was not unduly concerned by the prospect of managing on her own.

naturally, understandably
rightly
simply

about, at, by, over
The leadership was concerned at the perceived failure to find a solution,
Doctors are concerned at the prospect of patients having to wait up to a year for surgery.

for
We are now deeply concerned for his safety.

be

especially, particularly, specifically
entirely, exclusively, solely
centrally, chiefly, essentially, largely, mainly, mostly, predominantly, primarily, principally
Cubist painting was not primarily concerned with lifelike representation.

closely (esp. BrE), directly, intimately

with
Social anthropology is centrally concerned with the diversity of culture.

Concerned is used with these nouns:
citizen, expression, face, look, parent, party, voice