IPA: /ˈdʌstɪə/
KK: /ˈdʌstɪər/
Having more dust than something else; covered with more dust.
The old attic was dustier than I remembered from my childhood.
Comparative: dustier
Superlative: dustiest
Dustier → It is formed from "dust" (from Old English *dust*, meaning fine particles of earth or powder) and "-ier" (a comparative suffix indicating more of a quality). The word "dustier" means having more dust or being more covered in dust than something else.
Think of 'dust' as fine particles and remember that 'dustier' means having more dust than something else.