Synonyms of the word 
UNDEFEATED → SUCCESSFUL - TRIUMPHANT - UNBEATEN - UNBOWED - UNCONQUERED - UNVANQUISHED - VICTORIOUS
undefeated
- adj. never defeated; always victorious.
successful
- adj. Resulting in success; assuring, or promotive of, success; accomplishing what was proposed; having the…
triumphant
- adj. Celebrating victory.
unbeaten
- adj. not defeated.
- adj. untrodden.
- adj. Not beaten or whisked.
- adj. (cricket) not out.
unbowed
- adj. Not bowed; erect or upright.
- adj. Not subdued or deterred.
unconquered
- adj. Not conquered.
unvanquished
- adj. Not vanquished, beaten or conquered; unbeaten or unconquered.
victorious
- adj. Being the winner in a contest, struggle, war, etc.
- adj. Of or expressing a sense of victory or triumph.
If you are interested in words, visit the following sites :
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