Word of the Day - 08/10/26
indefatigable
/,ɪndɪ'fætəɡəbəl/(adj.): unable to be fatigued
The indefatigable researcher worked tirelessly for years, often staying in the lab until the early hours of the morning, driven by an unflagging passion to find a cure.
Word Origin
The word 'indefatigable' originates from Latin. It is formed from several parts: 'in-' (meaning 'not' or 'un-'), 'de-' (an intensive prefix), 'fatigare' (meaning 'to tire out' or 'to weary'), and '-able' (a suffix indicating 'capable of' or 'apt to'). Thus, 'indefatigable' literally means 'not capable of being tired out'.
Words with similar origins include 'fatigue' (from French 'fatigue', ultimately from Latin 'fatigare') and 'defatigate' (a less common word meaning to tire out, directly from Latin 'defatigare').