Erratic Definition

ĭ-rătĭk
adjective
Having no fixed course or purpose; irregular; random; wandering.
Webster's New World
Lacking consistency, regularity, or uniformity.
An erratic heartbeat.
American Heritage
Deviating from the normal, conventional, or customary course; eccentric; queer.
Webster's New World
Designating a boulder or rock formation transported some distance from its original source, as by a glacier.
Webster's New World

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

Henry has been getting erratic scores on his tests: 40% last week, but 98% this week.
Wiktionary
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noun
A rock fragment that has been transported by ice to a location other than its place of origin and that may range in size from a pebble to a large boulder.
American Heritage
An erratic person.
Webster's New World

Other Word Forms of Erratic

Noun

Singular:
erratic
Plural:
erratics

Origin of Erratic

  • Middle English erratik from Old French erratique from Latin errāticus from errāre to wander ers- in Indo-European roots

    From American Heritage Dictionary of the English Language, 5th Edition

  • From Old French erratique, from Latin erraticus.

    From Wiktionary

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