Meaning & use
irreplaceable
So valuable, unique, or important that nothing else could take its place.
See it in a sentence
The old photographs were irreplaceable after the house fire destroyed everything else.
Her experience makes her an irreplaceable member of the research team.
A note on using this word
Stronger than 'valuable'; it implies that no substitute could ever truly take the thing's place.
Words with a similar meaning
Choose a synonym to suit the sentence. Meanings can overlap without being identical.
Words with an opposite meaning
replaceableexpendable
Make it your own
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