IPA: /ɡrændɪst/
KK: /grændɪst/
The most impressive or magnificent; the highest degree of being grand.
The grandest castle in the kingdom attracted many visitors.
Comparative: grander
Superlative: grandest
Grandest → It is formed from "grand" (from Old French *grand*, meaning large or great) and "-est" (a superlative suffix indicating the highest degree). The word "grandest" means the largest or greatest in size or importance.
Think of 'grand' meaning large or great, and remember that 'grandest' refers to the largest or greatest of all.