Collocations for ambiguous - adj.

be
remain
leave sth, make sth, render sth
The paragraph is rendered ambiguous by the writer's careless use of pronouns.

highly, very
rather, slightly, somewhat
deliberately, intentionally
I suspected that he was being deliberately ambiguous.

morally, sexually
He is portrayed as a dark and somewhat morally ambiguous character.

Ambiguous is used with these nouns:
concept, message, reference, term, word, wording