ThesaurusLegend: Synonyms Related Words Antonyms
| Adj. | 1. |  undetectable - not easily seen |
| 2. |  undetectable - barely able to be perceived; "the transition was almost indiscernible"; "an almost insensible change"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" |
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