Enter a clue or pattern or both:
The Clue
Very slight or subtle (13 letter answer)
The Answer
IMPERCEPTIBLE
Tags
Notes
The answer IMPERCEPTIBLE is so rare that it appears less than once every 2500 puzzles.
Related Clues
Flea's alarmed discovery?
Definition
IMPERCEPTIBLE as an adjective:
1. (imperceptible, unperceivable) = impossible or difficult to perceive by the mind or senses; "an imperceptible drop in temperature"; "an imperceptible nod"; "color is unperceivable to the touch"