Simple Definition of tireless
: working very hard with a lot of energy for a long time : never seeming to get tired
Full Definition of tireless
: seemingly incapable of tiring : indefatigable <a tireless worker>
Examples of tireless
She has been a tireless advocate for reform.
<a tireless advocate for human rights>
First Known Use of tireless
TIRELESS Defined for Kids
Definition of tireless
: able to work or persist a long time without becoming tired
Seen and Heard
What made you want to look up tireless? Please tell us where you read or heard it (including the quote, if possible).