1. Showing signs of wear and tear
   "a grotty old overcoat";
   - moth-eaten, ratty, shabby, tatty [informal]
    
2. Foul and run-down and repulsive
   "a grotty apartment in the cheap part of town";
   - flyblown, squalid, sordid, skeevy [US, informal], skanky [informal]
    
3. Somewhat ill, feeling or being in bad health
   "I'm feeling grotty today";
   - ailing, indisposed, peaked, poorly, sickly, unwell, under the weather [informal], seedy [archaic], out of sorts [informal], off-colour [Brit, informal], crook [Austral, NZ, informal], cruddy [informal]

Derived forms: grottiest, grottier

See also: dirty, ill, sick, soiled, unclean, worn