undependable

Definitions

Not able to be relied upon or trusted.

Liable to fail or change unexpectedly; inconsistent.

Examples

The old car proved to be completely undependable during our long road trip.

He is known for being an undependable employee who frequently misses deadlines.

Synonyms

unreliable untrustworthy fickle irresponsible erratic inconsistent unstable

Antonyms

reliable dependable trustworthy consistent steadfast responsible stable