We found one dictionary that defines the word it won't do:

General (1 matching dictionary)

1. it won't do: Oxford Learner's Dictionaries

▸ Words similar to it won't do ▸ Usage examples for it won't do ▸ Idioms related to it won't do ▸ Wikipedia articles (New!) ▸ Words that often appear near it won't do ▸ Rhymes of it won't do ▸ Invented words related to it won't do