IPA: /sləˈvɛnliər/
KK: /sləˈvɛnli/
More careless or untidy in appearance or behavior than someone or something else.
His room is slovenlier than hers, with clothes scattered everywhere.
Slovenlier → It is formed from "sloven" (from Middle English *sloven*, meaning a person who is untidy or careless) and the suffix "-lier" (a comparative suffix indicating more of a quality). The word "slovenlier" means more untidy or more careless than another.
Think of a 'sloven' as someone who is untidy, and the '-lier' means more so. So, slovenlier describes someone who is even more careless or messy.
No commonly confused words.