All surely antonyms
sure·ly
S s adv surely
- imaginably — capable of being imagined or conceived.
- maybe — perhaps; possibly: Maybe I'll go too.
- conceivably — capable of being conceived; imaginable.
- could be — It's possible
adverb surely
- questionably — of doubtful propriety, honesty, morality, respectability, etc.: questionable activities; in questionable taste.
- indefinite — not definite; without fixed or specified limit; unlimited: an indefinite number.