1. In violation of good taste even verging on the indecent
   "an off-colour joke"
   - indelicate, off-color [US] 
2. Humorously vulgar
   "off-colour jokes"
   - bawdy, off-color [US], ribald 
3. [Brit] Somewhat ill or prone to illness
   - ailing, indisposed, peaked, poorly, sickly, unwell, under the weather, seedy, out of sorts, crook [Austral, NZ]

See also: dirty, ill, sick, tasteless

• religious sect
• religious service
• Religious Society of Friends
• religious song
• religious text
• religious trance
• religious writing
• religiousism
• religiously
• religiousness
• reline
• relinquish
• relinquished
• relinquishing
• relinquishment
• reliquary
• reliquiae
• relish
• relishable
• relishing
• relistening
• relive
• reliving
• reload
• relocatable program