- incredibly, improbably, implausibly, unbelievably - not easy to believe; "behind you the coastal hills plunge to the incredibly blue sea backed by the Turkish mountains"
Antonyms: believably
Derived from adjective unbelievable1
- unbelievably - in an unbelievable manner; "he was unbelievably angry"
Antonyms: believably
Derived from adjective unbelievable1