IPA: /ˈɡrʌmbliər/
KK: /ˈɡrʌmbli/
More inclined to complain or express dissatisfaction than usual.
After a long day, he felt grumblier than ever about the weather.
Comparative: grumblier
Superlative: grumbliest
Grumblier → The word is formed from "grumble" (of uncertain origin, possibly imitative of the sound of grumbling) and the suffix "-ier" (meaning more). The term "grumblier" refers to someone who is more inclined to grumble or complain.
Think of someone who is more likely to make grumbling sounds — that's what 'grumblier' means.