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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.

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Definitions of erratic from WordNet

erratic (adj.)
liable to sudden unpredictable change;
erratic behavior
erratic (adj.)
having no fixed course;
an erratic comet
Synonyms: planetary / wandering
erratic (adj.)
likely to perform unpredictably; "a temperamental motor; sometimes it would start and sometimes it wouldn't"; "that beautiful but temperamental instrument the flute"- Osbert Lancaster;
erratic winds are the bane of a sailor
Synonyms: temperamental
From wordnet.princeton.edu