adjective
undetectable
adjective
1
Impossible to notice or find using available methods.
"The poison was almost undetectable in a standard blood test."
How to Use Undetectable
Learner’s notesIn plain EnglishSo well-hidden or small that it can't be found or noticed.
Common pairings
virtually undetectable
undetectable levels
Word Forms
more undetectable comparative, most undetectable superlative
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The poison was almost _____ in a standard blood test.
Etymology
From un- plus detectable.