Search for the synonym (analogous) and antonym (opposite):
Synonyms: indisputably, truly, damn right, damn straight, fo shizzle, for sure, oh yeah, wye aye, absolutely, beyond doubt, indubitably, sure thing, undoubtedly, wis, without a doubt, definitely, doubtlessly, in fact, indeed, no doubt, really, sure, surely, unquestionably,
We have no antonyms for the word certainly
Dictionary:
Synonym of the Day: apparel.
The Random Synonym: closeted, explicable, existent, alternative fact,