IPA: /ˈstʌbiər/
KK: /ˈstʌbiər/
Having a short and thick appearance; not long or slender.
The stubbier branches of the tree were easier to climb than the longer ones.
Comparative: stubby
Superlative: stubbiest
Stubbier is formed from "stub" (from Middle English *stubbe*, meaning a short piece remaining after the main part has been removed) and the comparative suffix "-ier" (meaning more). The word "stubbier" means more like a stub, or shorter and thicker than something else.
Think of a 'stub' as a short piece left over, and remember that 'stubbier' means something is more like that short piece.