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erratic

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The definition of erratic is something that is not consistent or is lacking in a fixed course.

(adjective)

A mental patient who behaves in a wildly unpredictable manner, happy and kind one minute and angry and shouting the next, is an example of someone witherratic behavior.

See erratic in Webster's New World College Dictionary

adjective

having no fixed course or purpose; irregular; random; wandering
deviating from the normal, conventional, or customary course; eccentric; queer
Geol. designating a boulder or rock formation transported some distance from its original source, as by a glacier

Origin: ME erratik < OFr erratique < L erraticus, wandering < pp. of errare: see err

noun

an erratic person

Related Forms:

erratically adverb

See erratic in American Heritage Dictionary 4

adjective

Having no fixed or regular course; wandering.
Lacking consistency, regularity, or uniformity: an erratic heartbeat.
Deviating from the customary course in conduct or opinion; eccentric: erratic behavior.

Origin:

Origin: Middle English erratik

Origin: , from Old French erratique

Origin: , from Latin errāticus

Origin: , from errāre, to wander; see ers- in Indo-European roots

Related Forms: