undetectably
Beyond all perception
In a way that cannot be detected or noticed.
The adverb typically modifies actions meant to evade observation or measurement: The spy slipped undetectably through the crowd.
It often appears in technical contexts where precision matters: The counterfeit was almost undetectably different from the original.
Without being seen
- subtlyWith quiet nuance
- imperceptiblyBelow detection threshold
- indiscerniblyIn an unnoticeable manner
- inaudiblyBeyond perception by ear
unnoticeably · faintly · slightly · microscopically · gradually · seamlessly · silently · unobtrusively
In a covert manner
- secretlyWithout others' knowledge
- surreptitiouslyIn a hidden manner
- clandestinelyIn a hidden manner
- furtivelyIn a secretive manner
sneakily · invisibly · incognito · undercover · covertly · infiltrate · espionage · spy
Transformed into cipher
- untraceableImpossible to follow back
- anonymousOf unknown origin
- maskedHaving face covered
- spoofedMocked through imitation
cloaked · scrambled · steganography · surveillance · forensics · malware · rootkit · backdoor
invisibly
Without being seen
- subtlyWith quiet nuance
- imperceptiblyBelow detection threshold
- indiscerniblyIn an unnoticeable manner
inaudibly · unnoticeably · faintly · slightly · microscopically · gradually · seamlessly · silently · unobtrusively · inconspicuously
stealthily
In a covert manner
- secretlyWithout others' knowledge
- surreptitiouslyIn a hidden manner
- clandestinelyIn a hidden manner
furtively · sneakily · invisibly · incognito · undercover · covertly · infiltrate · espionage · spy · lurk
encrypted
Transformed into cipher
- untraceableImpossible to follow back
- anonymousOf unknown origin
- maskedHaving face covered
spoofed · cloaked · scrambled · steganography · surveillance · forensics · malware · rootkit · backdoor · bypass
undetectablydetectably
In discernible manner
perceptibly · noticeably · measurably · discernibly · observably
undetectablyobviously
In an apparent manner
conspicuously · clearly · plainly · manifestly · blatantly