We found one dictionary that defines the word least-frequently used:

General (1 matching dictionary)

1. Least-frequently used: Wikipedia, the Free Encyclopedia

▸ Words similar to least-frequently used ▸ Usage examples for least-frequently used ▸ Idioms related to least-frequently used ▸ Wikipedia articles (New!) ▸ Words that often appear near least-frequently used ▸ Rhymes of least-frequently used ▸ Invented words related to least-frequently used