different between firelessly vs tirelessly

English

fireless +? -ly

firelessly (not comparable)

In a fireless way; without fire.
- 1925, Richardson Little Wright, House and Garden's Second Book of Houses
  An important feature of the room is the electric range which has the required special wiring. It is of the pattern which cooks firelessly as well.
- 2000, Thomas Wolfe, Arlyn Bruccoli, Matthew Joseph Bruccoli, O Lost: A Story of the Buried Life
  A hot mass of coals glowed firelessly in the hearth.

tireless +? -ly

tirelessly (comparative more tirelessly, superlative most tirelessly)

In a tireless manner; without tiring, flagging, or ceasing.
The volunteers worked tirelessly to improve the content.

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