Ineluctable

adjective/in-ee-LUK-tuh-bul/

Meaning

Impossible to avoid or escape; certain to happen.

In context
The ineluctable end of the holidays meant packing his school bag again.

Remember it

Ineluctable = in (not) + eluct (struggle out) — you cannot struggle out of it, so it must happen.

Use it well

Use 'ineluctable' for something completely unavoidable; a very formal word for 'inevitable'.