IPA: /ˈhɑrdɪst/
KK: /hɑrdɪst/
The most difficult or challenging; requiring a lot of effort or strength.
This is the hardest test I have ever taken.
Comparative: harder
Superlative: hardest
Hardest → It is formed from "hard" (from Old English "heard", meaning solid or firm) and "-est" (a superlative suffix indicating the highest degree). The word "hardest" means the most solid or firm, indicating the highest level of difficulty or resistance.
Think of something that is the most 'solid' or 'firm' — 'hard' means solid, and '-est' shows it's the highest degree of that quality.