Indefatigable is an adjective that means incapable of being fatigued.

The root word of indefatigable is ‘fatigue’ a word that means ‘to feel tired or exhausted.’ Its origin is from the Latin word ‘fatigare,’ (fah tee GAR ay) which means ‘to weary’ or ‘tire out.’ Our word of the day simply describes a person that cannot be ‘tired out.’

Our indefatigable secretary Doris deserves a great deal of credit for the latest project’s success. She spent countless hours in the office to make sure everything got done.