UNBEKNOWNST Scrabble 20 Words With Friends 25 Definition adverb without someone's knowledge. — synonyms: unbeknown adjective (usually used with `to') occurring or existing without the knowledge of. — synonyms: unbeknown(p), unbeknownst(p) See all 299 words you can make from UNBEKNOWNST → 11-letter words Words starting with U Words ending with T ← Unscramble different letters