ASL Sign Language Dictionary

Search and compare thousands of words and phrases in American Sign Language (ASL). The largest collection online.

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How to sign: working or spreading in a hidden and usually injurious way
"glaucoma is an insidious disease"; "a subtle poison";

insidious in ASL Watch how to sign insidious in American Sign Language
insidious - SMARTSign Dictionary
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Similiar / Same: pernicious, subtle

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