[ ih-rat-ik ]
/ ɪˈræt ɪk /


deviating from the usual or proper course in conduct or opinion; eccentric; queer: erratic behavior.
having no certain or definite course; wandering; not fixed: erratic winds.
Geology. noting or pertaining to a boulder or the like carried by glacial ice and deposited some distance from its place of origin.
(of a lichen) having no attachment to the surface on which it grows.


an erratic or eccentric person.
Geology. an erratic boulder or the like.

Origin of erratic

1325–75; Middle English < Latin errāticus, equivalent to errāt(us) (past participle of errāre to err) + -icus -ic

Related forms

Can be confused

erotic erratic exotic Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for erratic

British Dictionary definitions for erratic


/ (ɪˈrætɪk) /


irregular in performance, behaviour, or attitude; inconsistent and unpredictable
having no fixed or regular course; wandering


a piece of rock that differs in composition, shape, etc, from the rock surrounding it, having been transported from its place of origin, esp by glacial action
an erratic person or thing

Derived Forms

erratically, adverb

Word Origin for erratic

C14: from Latin errāticus, from errāre to wander, err
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012