UNTIMELIEST

Adjective

untimeliest

superlative form of untimely: most untimely

Source: Wiktionary

UNTIMELY

Un*time"ly, a.

Definition: Not timely; done or happening at an unnatural, unusual, or improper time; unseasonable; premature; inopportune; as, untimely frosts; untimely remarks; an untimely death.

Un*time"ly, adv.

Definition: Out of the natural or usual time; inopportunely; prematurely; unseasonably. "Let them know . . . what's untimely done." Shak.

Source: Webster’s Unabridged Dictionary 1913 Edition