1. undetectable - Adjective
2. undetectable - Adjective Satellite
barely able to be perceived
not easily seen
Source: WordNetAmbivalence is like carbon monoxide - undetectable yet deadly. Cherie Carter-Scott
Its heart that in flight contracted a thousand times a minute, slows until its beat is virtually undetectable. Its body temperature falls dramatically, and its breathing seems to cease altogether. [...] It's hibernating; but for a hummingbird, winter comes 365 times a year. David Attenborough
the transition was almost indiscernible Source: Internet
an almost insensible change Source: Internet
Again, hop presence is low to undetectable, providing just enough bitterness so that the sweetness is not cloying and the aftertaste is muted. Source: Internet
Bottom: With an enormous number of solute molecules, randomness becomes undetectable: The solute appears to move smoothly and systematically from high-concentration areas to low-concentration areas. Source: Internet