Unreliably
/ˈʌnrɪˈlaɪəbli/
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Definition
(adv) In an unreliable manner.
Sentence Examples
The old machine worked unreliably and often broke down at work.
If a person acts unreliably, it is very hard to trust them at all.
CEFR Practice Quiz
The machine was performing ____, so we had to call a technician to see if it could be repaired today.