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English definition of “erratic”

erratic

adjective     /ɪˈræt.ɪk/ US  /-ˈræt̬-/
not regular, uncertain, or without organization in movement or behaviour: He drove in an erratic course down the road. She can be very erratic, one day she is friendly and the next she'll hardly speak to you.Frequency and regularity - general words erratically     /-ɪ.kəl.i/ adverb In her study, books were arranged erratically on chairs, tables and shelves. The machine is working erratically - there must be a loose connection.Frequency and regularity - general words
(Definition of erratic adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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