1
[ adjective ] liable to sudden unpredictable change

Examples

"erratic behavior" "fickle weather" "mercurial twists of temperament" "a quicksilver character, cool and willful at one moment, utterly fragile the next"

Used in print

(Francis J. Johnston and John E. Willard, "The...)

The liquid phase photochemical_exchange between chlorine and carbon_tetrachloride was more reproducible than the thermal exchange , although still erratic .

Related terms

changeable

2
[ adjective ] having no fixed course

Synonyms

wandering planetary

Examples

"an erratic comet" "his life followed a wandering course" "a planetary vagabond"

Related terms

unsettled

3
[ adjective ] likely to perform unpredictably

Synonyms

temperamental

Examples

"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

Related terms

unreliable

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