erratic

Definition

Unsteady, random; prone to unexpected changes; not consistent.

Etymology

From Middle English erratik, erratyk, from Latin errāticus; compare Old French erratique.

Example Sentences

• "Henry has been getting erratic scores on his tests: 40% last week, but 98% this week."
• "The V-2's directional system was notoriously erratic. In May 1947, a V-2 launched from White Sands Proving Ground headed south instead of north, missing downtown Juarez, Mexico, by 3 miles."
• "erratic conduct"