How many letters does the top answer for “in an unfaithful undependable unreliable manner” have?

The most common answer is unfaithfully (12 letters).

Crossword clue: in an unfaithful undependable unreliable manner

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

unfaithfully 12 letters wn-def

in an unfaithful undependable unreliable manner

unreliably 10 letters wn-def

in an unfaithful undependable unreliable manner