different between firless vs firmless

English

fir +? -less

firless (not comparable)

(rare) Without fir trees.
- 1882, William Yarrell, Alfred Newton, Howard Saunders, A history of British birds
  The Great Desert of Africa of course puts a limit to its wanderings, and the firless plains of Egypt equally discourage its approach.

firm +? -less

firmless (comparative more firmless, superlative most firmless)

(obsolete) Detached from physical substance.
- 18th century, Alexander Pope, Verses to Dr. Bolton
  Does passion still the firmless mind control?
(obsolete) Infirm; unstable.

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