1. Never having lost

See also: unconquerable

• stockroom
• stocks
• stocktake
• stocktaker
• stocktaking
• Stockton
• stocky
• stockyard
• stodge
• stodgily
• stodginess
• stodgy
• stoep
• stogie
• stogy
• stoic
• stoical
• stoically
• stoichiometric
• stoichiometry
• stoicism
• stoke
• stokehold
• stokehole
• stoker