IPA: /ˈstreɪtɪst/
KK: /ˈstreɪtɪst/
The most narrow or tight in space or direction.
This is the straightest path to the top of the mountain.
Comparative: straighter
Superlative: straitest
Straightest → It is formed from "straight" (from Old English "streht", meaning not bent or direct) and the superlative suffix "-est" (meaning most). The word "straightest" means the most direct or least bent in comparison to others.
Think of something that is 'not bent' ('straight') and remember that 'straightest' means the most direct or least bent of all.