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unreliable

un·re·li·a·ble

unreliable

pronunciation:
uhn rih laI bl
part of speech: adjective
definition: not able to be relied on.
Her old car is very unreliable in cold weather.The worker was fired for being unreliable.
antonyms:
authoritative, faithful, reliable, steady
similar words:
irresponsible, shaky
derivation: unreliably (adv.)