possibly
Definitions
Used to express that something may happen or be true, but is not certain.
Used to indicate that something is within the realm of feasibility or capability.
Used as a polite or emphatic way to express uncertainty or doubt.
Examples
It is possibly going to rain later this afternoon.
We could possibly finish the project by Friday if we work together.
Synonyms
potentially perhaps maybe conceivably perchance feasibly imaginably
Antonyms
definitely certainly undoubtedly surely absolutely unquestionably positively