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English definition of “erratic”

erratic

adjective uk   /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.
erratically
adverb uk   /-ɪ.kəl.i/ us  
In her study, books were arranged erratically on chairs, tables and shelves. The machine is working erratically - there must be a loose connection.
(Definition of erratic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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