Antonyms of adj for_sure

1 sense of for sure

Sense 1
for sure -- (not open to doubt; "she wanted to go; that was for sure")

INDIRECT (VIA unquestionable) -> questionable -- (subject to question; "questionable motives"; "a questionable reputation"; "a fire of questionable origin")

Similarity of adj for_sure

1 sense of for sure

Sense 1
for sure -- (not open to doubt; "she wanted to go; that was for sure")
       => unquestionable (vs. questionable) -- (incapable of being questioned; "unquestionable authority")

Synonyms of adv for_sure

1 sense of for sure

Sense 1
surely, certainly, sure, for sure, for certain, sure enough, sure as shooting -- (definitely or positively (`sure' is sometimes used informally for `surely'); "the results are surely encouraging"; "she certainly is a hard worker"; "it's going to be a good day for sure"; "they are coming, for certain"; "they thought he had been killed sure enough"; "he'll win sure as shooting"; "they sure smell good"; "sure he'll come")