Collocations for frank - adj.

be

extremely, fairly, very, etc.
remarkably
absolutely, perfectly, quite
Let me be perfectly frank with you.

disarmingly, refreshingly (esp. BrE)
She surveyed Sophie from top to toe in a disarmingly frank way.

brutally
She was brutally frank in her assessment of our chances.

surprisingly

about
Macmillan was quite frank about his concerns.

with
To be frank with you, I don't really think you have a chance.

full and frank
a full and frank exchange of views

to be frank (with you) …
To be frank, I don't care who wins.

Frank is used with these nouns:
admiration, admission, discussion, exchange