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Douglas Harper's Etymology Dictionary
undetectable

1789, from un- (1) "not" + detectable (see detect (v.)).

Wiktionary
undetectable

a. Unable to be detected; not detectable.

WordNet
undetectable
  1. adj. not easily seen

  2. barely able to be perceived; "the transition was almost indiscernible"; "an almost insensible change" [syn: indiscernible, insensible]

Usage examples of "undetectable".

Esterases in the body break the drug down rapidly into acetylcholine, so it is also likely to be undetectable, unless the target happens to croak right outside a primo medical center with a very sharp pathologist who is looking for something out of the ordinary.

Esterases in the body break the chemical down into acetylcholine fairly rapidly, so it is very likely to be undetectable, even by someone up at Columbia-Presbyterian.

The SHARKTOOTH, which looked up and forward to find the ice, was an active pinging sonar but faint to being nearly undetectable.

If so, then at what point had the worldcopying occurred, the subjectively undetectable branching-off from Groundworld, the creation of his present, simulacral consciousness?

He had always prided himself on maintaining the volto sciolto, pensieri stretti rather better than most men, and here were illiterate tarpaulins comforting him for a distress that he could have sworn was perfectly undetectable.

Music that enfolds you, coming from some undetectable set of sources, is gimmicky, unreal, and eminently forgettable.

We repeat, however, that books, films, spools, and exhibits on such subjects as shoplifting, explosives, safe-cracking, mental-suggestion, seduction, death rays, hypnotism, aphrodisiacs, sabotage, secret jujitsu blows, and undetectable murder methods are forbidden under a law which has just been enacted.

Virtually undetectable until it was activated, at which point it fired a microburst location signal.

Unlike the standard high-frequency communications, which were vulnerable to foreign direction-finding antennas, the moon-bounce signal was virtually undetectable because it used hard-to-intercept directional microwave signals.

Living with Debbie had taught Moon the value of small, undetectable lies told in the interest of keeping things peaceful.

Nobody had any idea of the range of the undetectable weapons that had killed two Raptors and three Dragons, but they hoped they were line of sight.

I knew that the nanotech neuro-attenuators swam invisibly and independently to the top of my tea as a barely visible sheen, undetectable.

Your Great Uncle Cuht New Managing Director Biographies Publishing Company THE TRUE AND FINAL END OF MISSION EARTH Key to THE DOOMED PLANET Absorbo-coat—Coating that absorbs light waves, making the object virtually invisible or undetectable.

The devisement he and Alastair had cast upon it would be almost invisible, undetectable by all but the most proficient of devisers.

As a last-moment thought, he splashed his face with after-shave lotion on the off-chance that a crew member might somehow smell the supposedly undetectable vodka.