Adjective
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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"- Osbert Lancaster
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having no fixed course
"an erratic comet"
"his life followed a wandering course"
"a planetary vagabond"
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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"