unbelievably
1. [ adverb ] not easy to believe
Synonyms: incredibly implausibly improbably
Examples:

"behind you the coastal hills plunge to the incredibly blue sea backed by the Turkish mountains"

Related terms: believably credibly incredible incredible improbable implausible incredible
2. [ adverb ] in an unbelievable manner
Examples:

"he was unbelievably angry"

Related terms: believably incredible incredible
Similar spelling:   unbelievable
  unbelievingly
  unbeliever
  unbelieving