Collocations for concerned - adj.

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

deeply, especially, extremely, genuinely, greatly, particularly, really, seriously, very | increasingly | a bit, a little, quite, rather, slightly, somewhat | (not) unduly
She was not unduly concerned by the prospect of managing on her own.

naturally | rightly | simply

about/at/by/over
Doctors are concerned at the prospect of heart 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
Mathematics is concerned essentially with understanding abstract concepts.

closely, directly, intimately

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