Erratic

google

ref

late Middle English: from Old French erratique, from Latin erraticus, from errare ‘to stray, err’.

wiktionary

ref

From Latin erraticus; compare Old French erratique.

etymonline

ref

erratic (adj.)

late 14c., "wandering, moving," from Old French erratique "wandering, vagrant" (13c.) and directly from Latin erraticus "wandering, straying, roving," from erratum "an error, mistake, fault," past participle of errare "to wander; to err" (see err). Sense of "irregular, eccentric" is attested by 1841. The noun is from 1620s, of persons; 1849, of boulders. Related: Erratically.