freakishly

/ˈfriːkɪʃli/
adverb
  1. In a way that is very unusual, strange, or unexpected, often in an extreme or remarkable manner.
    • The athlete's freakishly long arms gave him an advantage in swimming.
    • The weather was freakishly warm for December, reaching 70 degrees.
    • She is freakishly good at solving puzzles, finishing them in minutes.
Antonyms