Indefatigable

Indefatigable

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tireless; persistent; energetic;

being consistent and untiring.

The indefatigable dog chased the ball all day. He never got tired.

Memory trick:
indefatigable reminds of "not fatigue".
fatigue means to be tired.

At work:
We are successful because of your indefatigable hard work. You never quit.

(c) 2015 E. Carruthers