brief
fair
What she said was fair comment. (BrE)
What she said was a fair comment. (BrE, AmE)

favourable/favorable, nice, positive
adverse, derogatory, disparaging, negative, unfavourable/unfavorable
critical
Highly critical comments have been made about the conduct of some politicians.
a book with critical comment on the various strands of feminism

hostile, snarky (AmE,informal), snide, unfair
caustic, scathing
rude, sardonic, smart-ass (AmE,informal), stupid
ironic, sarcastic, wry
witty
constructive, helpful, useful, valuable
incisive, insightful, interesting, perceptive, shrewd
cryptic
uninformed (esp. BrE)
general
detailed
casual, offhand, off-the-cuff, passing, throwaway
He made a few casual comments to her about her hair and now she's chopped it all off!
This idea deserves more than passing comment.

editorial, official, personal, press, public
Editorial comment in the press tended to support the government in this matter.

written
political, social
Her novels were a vehicle for shrewd social comment.

sad
The attack is a sad comment on the public's understanding of mental illness.

have, make, pass
If you have any comments, please send them to the above address.
She made a cryptic comment about how the movie mirrored her life.
I would prefer not to pass comment before I have more information on the case.

give, offer
add, leave, post (= on the Internet), send, submit, write
Feel free to post your comments if you have any.

read
hear
attract, cause, draw, elicit, excite
The article attracted much adverse comment.

appreciate, invite, seek, welcome
The school has invited comments from parents about the new curriculum.

get, receive
We have received many helpful comments from fellow-sufferers.

decline (AmE)
KPJ officials declined comment.

disregard, ignore
direct
She directed all her comments at Steve.

without comment
She accepted his diagnosis without comment.

comment about, comment on
a general comment on the weather

comment from
We welcome comments from readers.

be available for comment, be unavailable for comment
The spokesman was not available for comment last night.

no comment
When asked about the allegations, the chairman replied ‘no comment’.

a source of comment
His visits were the source of much comment.

questions and comments
Viewers are encouraged to phone in questions and comments.

favourably/favorably
adversely (esp. BrE), critically, unfavourably/unfavorably
bitterly, sarcastically
drily, wryly
quietly, softly
publicly

decline to, refuse to
The president refused to comment on the affair.

about
People were commenting about her abilities.

on
He refused to comment on the proposals.

to
She commented to me that she liked it.

Comment is used with these nouns as the subject:
report