irreplaceable

Definitions

Impossible to replace if lost or damaged because of unique value or quality.

So valuable or essential that no substitute can be found.

Examples

The loss of such an irreplaceable mentor has left a void in the entire department.

She realized that the vintage watch was irreplaceable and handled it with extreme care.

True friendship is irreplaceable, no matter how many new people you meet in life.

Synonyms

unique invaluable indispensable priceless unrepeatable singular matchless

Antonyms

replaceable expendable dispensable common ordinary surplus redundant