Imperceptible

(adj.) difficult to percieve by the senses;barely noticeable

Synonyms

undetectable, invisible

Antonyms

obvious, standouts

Sentences

1) The paintings at the museum had imperceptible people hidden in them.

2) A lot of animals use camouflage to make them imperceptible to their predators.

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Shapeshifting Octopus, amazing camouflage