How many letters does the top answer for “not hitherto described; novel; hence, odd; abnormal; unclassifiable.” have?

The most common answer is nondescript (11 letters).

Crossword clue: not hitherto described; novel; hence, odd; abnormal; unclassifiable.

1 answer found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

nondescript 11 letters web-def

a person is not easily classified and not very interesting