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say it: i-RAT-ik
erratic is an adjective meaning "liable to sudden unpredictable change". It carries 3 recorded senses.
liable to sudden unpredictable change
“erratic behavior”
“fickle weather”
“mercurial twists of temperament”
“a quicksilver character, cool and willful at one moment, utterly fragile the next”
having no fixed course
“an erratic comet”
“his life followed a wandering course”
“a planetary vagabond”
likely to perform unpredictably
“erratic winds are the bane of a sailor”
“a temperamental motor; sometimes it would start and sometimes it wouldn't”
“that beautiful but temperamental instrument the flute”
Definitions, synonyms and semantic relations for erratic come from Princeton University’s WordNet. The pronunciation comes from the CMU Pronouncing Dictionary. Commonness is measured against a corpus of everyday English. Full sources and licences.