unbelievably has 3 distinct synonyms spread across 1 of its 2 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. Its one recorded opposite is believably.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
not easy to believe
“incredibly, she survived the crash”
in an unbelievable manner
“he was unbelievably angry”
Synonyms, antonyms and the broader and narrower relations for unbelievably come from Princeton University’s WordNet. Full sources and licences.