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“more undetectable”
undetectable (adjective), more undetectable, most undetectable
1. Impossible to be noticed or perceived: The thief in the story wore a magic cloak that made him undetectable or invisible so he wouldn't be caught!
A color, for example is undetectable to the touch!
2. Hardly able to be seen or discerned: The fall in the temperature outside was undetectable and could hardly be felt.