rummest

/ˈrʌmɪst/
adjective
  1. Superlative of rum; most odd, strange, or peculiar.
    • That was the rummest excuse I've ever heard for missing a deadline.
    • Of all the characters in the book, the old sailor was the rummest of them all.
    • She told the rummest story about a talking parrot that solved a mystery.