1. Not easy to believe
   - incredibly, improbably, implausibly 
2. In an unbelievable manner
   "he was unbelievably angry"

See also: unbelievable

Antonym: believably

• minor term
• minor tranquilizer
• minor tranquilliser
• minor tranquillizer
• minor-league club
• minor-league team
• Minorca
• Minorcan
• minority
• minority leader
• minors
• Minos
• Minotaur
• minoxidil
• Minsk
• minster
• minstrel
• minstrel show
• minstrelsy
• mint
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• mint sauce