undefeated

As a letter s

is the letter s with a.

As an adjective undefeated is

never defeated; always victorious.

As an adjective undefeated

is never defeated; always victorious.

As a noun null is

zero, nil; the cardinal number before einn.

As adjectives the difference between undefeated and invincible

is that undefeated is never defeated; always victorious while invincible is impossible to defeat, destroy or kill.

As a noun invincible is

someone or something that cannot be defeated, destroyed or killed.

As an adjective undefeated

is never defeated; always victorious.

As a letter x is

the twenty-fourth letter of the.

As a symbol x is

voiceless velar fricative.

As adjectives the difference between undefeated and false

is that undefeated is never defeated; always victorious while false is (label) one of two states of a boolean variable; logic.

As adjectives the difference between undefeated and undefined

is that undefeated is never defeated; always victorious while undefined is lacking a definition or value.

As adjectives the difference between lossless and undefeated

is that lossless is free from loss, especially not losing electrical energy or force while undefeated is never defeated; always victorious.

As adjectives the difference between unbearable and undefeated

is that unbearable is so unpleasant or painful as to be unendurable while undefeated is never defeated; always victorious.

As adjectives the difference between undisputed and undefeated

is that undisputed is universally agreed upon; not disputed while undefeated is never defeated; always victorious.