IPA: /ˈsʌnpruːf/
KK: /sʌnpruf/
Not allowing sunlight to pass through, protecting against sun rays.
I bought a sunproof umbrella to keep me cool at the beach.
Comparative: more sunproof
Superlative: most sunproof
Sunproof → It is formed from "sun" (from Old English "sunne", meaning the star that provides light and warmth) and "proof" (from Old English "profa", meaning to test or to demonstrate). The word "sunproof" means capable of resisting or protecting against the effects of the sun.
Think of the sun as the source of light and warmth, and 'proof' as a way to show resistance. This helps you remember that 'sunproof' means something that protects against the sun.