Webster's Revised Unabridged Dictionary · 1913

Worser

Worser , adjective

Worse. [Rare]
Thou dost deserve a worser end. — Beau. & Fl
From worser thoughts which make me do amiss. — Bunyan
A dreadful quiet felt, and, worser far Than arms, a sullen interval of war. — Dryden

This old and redundant form of the comparative occurs occasionally in the best authors, although commonly accounted a vulgarism. It has, at least, the analogy of lesser to sanction its issue. See Lesser. “The experience of man's worser nature, which intercourse with ill-chosen associates, by choice or circumstance, peculiarly teaches.”