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say it: uhn-di-TEK-tuh-buhl
undetectable is an adjective meaning "not easily seen". It carries 2 recorded senses.
not easily seen
barely able to be perceived
“the transition was almost indiscernible”
“an almost insensible change”
Definitions, synonyms and semantic relations for undetectable come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.