How many letters does the top answer for “want of proficiency; failure to make progress.” have?

The most common answer is nonproficiency (14 letters).

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Crossword clue: want of proficiency; failure to make progress.

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

nonproficiency 14 letters web-def

Want of proficiency; failure to make progress.

Pattern

Data: SCOWL, igerman98, RLA-ES, Grammalecte, br.ispell · frequency: OpenSubtitles (see Data & licenses)