NSW Opportunity Class
Indispensable
adjective/in-diss-PEN-suh-bul/
So necessary that you cannot manage without it.
In contextHer calm leadership made her indispensable to the whole team.
Remember it
In- (not) + dispensable — you cannot dispense with it, cannot do without it.
Use it well
Use it for people or things you absolutely cannot do without; stronger than 'useful'.