undependable
adjectiveUK /ˌʌndɪˈpendəbl/
US /ˌʌndɪˈpendəbl/
Not able to be trusted to do what they say.
The old car is undependable and often breaks down.
OTHER MEANINGS
2. Not able to be counted on to work correctly.
The undependable internet connection made it hard to finish the video call.
3. Changing in behavior so you never know what to expect.
His undependable moods made the team nervous.
4. Not steady or strong enough to be relied on.
The undependable ladder wobbled every time someone climbed it.