undefeated
//ˌʌndɪˈfiːtɪd//
Adjective
undefeatedCanonical form
1
Not having lost any games, matches, or battles; having won every contest or competition.
The team remained undefeated throughout the entire season.
2
Not overcome or conquered; remaining victorious or unconquered.
The ancient fortress remained undefeated despite numerous attacks.