1. [adj]  conspicuously or grossly unconventional or unusual; "restaurants of bizarre design--one like a hat, another like a rabbit"; "famed for his eccentric spelling"; "a freakish combination of styles"; "the outlandish clothes of teenagers"; "outre and affected stage antics"
2. [adj]  (slang) strange and somewhat frightening; "the whole experience was really freaky"

FREAKY is a 6 letter word that starts with F.