IPA: /ˈɡluːmiər/
KK: /ˈɡlumɪər/
More dark or sad than something else; having a more depressing or dismal atmosphere.
The weather today is gloomier than it was yesterday.
Comparative: gloomier
Superlative: gloomiest
Gloomier → It is formed from "gloom" (from Old English *glōm*, meaning darkness or shadow) and the comparative suffix "-ier" (meaning more). The word "gloomier" means more filled with gloom or darkness than something else.
Think of the word 'gloom' which means darkness, and remember that 'gloomier' means more filled with that darkness.