Key: "S:" = Show Synset (semantic) relations, "W:" = Show Word (lexical) relations
Display options for sense: (gloss) "an example sentence"
Adjective
S: (adj) 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"