Example usage:

Terence, you have indefatigable enthusiasm. The effect it has on people is inspiring.

In the sense of exuberance, but you feel positively about it.

  • It just means tireless. Can tireless ever be negative? Yes. – tchrist Feb 22 '13 at 14:24
  • It has a negative connotation if you're asked to read it aloud with no warning, since no one can remember how it's pronounced. – Hot Licks Aug 14 '17 at 11:52
  • If you feel positively about it then it has a positive connotation. – Arm the good guys in America Aug 14 '17 at 12:49

On its own: positive.

Modifying a neutral quality: positive.

However, it's not incorrect to use it as a modifier of a negative quality, so the obviously negative "your indefatigable stupidity continues to amaze me" is a valid use, too.


Yes, indefatigable is a word with positive connotations (here). The repeated use of indefatigable as a warship name underlines the general tone of approval.

  • 1
    I understand the idea of describing an inanimate object as indefatigable, but I was unsure whether it could positively describe a person's character. – Ash Clarke Feb 22 '13 at 13:48
  • 1
    The OED has plenty of citations for indefatigable where it does not appear to have a particularly positive aspect. Yes, saying that someone is “tireless” does seem in general positive, but consider “relentless”. – tchrist Feb 23 '13 at 1:20
  • Though I agree it's largely positive, be wary using it with reference to a person's character, though, as the situation is much more complex there. – Dan Sheppard Aug 31 '14 at 20:30

The word 'indefatigable' is a positive word. It means persisting or working tirelessly. The word tireless itself gives out postitivty and optimism, if used as an adjective for somebody. Hence, it has a positive connotation.

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