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Webster 1913 Edition

Adj.

Without face or front; shameless; not diffident; impudent.

[Obs.]

“Frontless vice.”

Dryden.

“Frontless flattery.”

Pope.

Adj.

Wanting shame or modesty; not diffident; as frontless vice; frontless flattery.

frontless ‎(comparative more frontless, superlative most frontless)