How many letters does the top answer for “not having a duct” have?

The most common answer is ductless (8 letters).

Crossword clue: not having a duct

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

ductless 8 letters wn-def

not having a duct

not having a coating 50% similar → uncoated

not having a cord 50% similar → cordless

not having a job 50% similar → jobless

not having a leg. 50% similar → legless

not having a smile. 50% similar → smileless

not having a tail 50% similar → anurous, tailless