Smudge-proof means made not to smear once it has set. Smudge-proof mascara, a smudge-proof liner.
It works by drying to a film rather than staying wet, which is also why it is harder to remove. Nothing is entirely smudge-proof, and the word is a claim rather than a promise.
1adjectivesmudge-proofMade not to smear once it has set.
“The smudge-proof liner survived a very long day.”
smudge-proof is a quality.
Practised in Beauty & Cosmetics