How many letters does the top answer for “not perceptible to the touch.” have?

The most common answer is intactable (10 letters).

Crossword clue: not perceptible to the touch.

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

intactable 10 letters web-def

Not perceptible to the touch.

intactible 10 letters web-def

Not perceptible to the touch.

the quality of being intangible and not perceptible by touch 50% similar → impalpability, intangibility, intangibleness