unpredictable

US /ˌʌnprɪˈdɪktəbəl/

UK /ˌʌnprɪˈdɪktəbl/

B1
adj.AdjectiveDifficult to guess about (the future)
Traffic in the city can be unpredictable, so leave yourself extra time
adj.AdjectiveCharacterized by erratic or inconsistent behavior.
His behavior is unpredictable; one minute he's happy, the next he's angry.

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