1. Not exhibiting or characterized by careful thought
   - unthinking, unthoughtful

See also: thoughtless

• John Robinson Jeffers
• John Rock
• John Roderigo Dos Passos
• John Roebling
• John Ronald Reuel Tolkien
• John Ross
• John Rowlands
• John Roy Major
• John Rupert Firth
• John Ruskin
• John Rutledge
• John Scopes
• John Scott Haldane
• John Simmons Barth
• John Singer Sargent
• John Singleton Copley
• John Smith
• John Speke
• John Steinbeck
• John Stuart Mill
• John the Baptist
• John the Divine
• John the Evangelist
• John Thomas Scopes
• John Tradescant