Impervious

adjective/im-pur-vee-us/

Meaning

not allowing fluid to pass through; unable to be affected by.

In context
He seemed impervious to the cold.

Remember it

Im- (not) + per (through) + via (way): no way through — water and insults simply bounce off.

Use it well

Pairs with 'to': impervious to water, impervious to criticism; suits surfaces and tough characters.