Here are examples of the word/phrase "limitless" used in a sentence and paraphrased in a sentence...
With his limitless power, the final boss of the game seemed invincible.
With his illimitable power, the final boss of the game seemed invincible.
As long as he continues to absorb yellow sunlight, Superman's power is limitless.
As long as he continues to absorb yellow sunlight, Superman's power is illimitable.
Because he is a reality warper, the options for what he can do are limitless.
Because he is a reality warper, the options for what he can do are illimitable.
Other Examples...