irreplaceable
adjective/ĩ.suʃ.ti.tu.iˈvɛɫ/medium
in·subs·ti·tu·í·vel
Definition
That cannot be replaced; unique or essential.
Her expertise is irreplaceable to the project.
These historical artifacts are irreplaceable.
Common collocations
irreplaceable valueirreplaceable role
Etymology
Do latim 'insubstituibilis'.