different between rustless vs trustless

English

rust +? -less

rustless (not comparable)

That does not rust; stainless.
- 1936, Arthur Guiterman, First Dentistry was Painless
  Now motor roads are dustless,
  The latest steel is rustless,
  Our tennis courts are sodless,
  Our new religions, godless.
Without rust; unrusted.
- 1903, Proceedings of the American Society of Civil Engineers, Volume 29, Part 1
  All this upper work, however, was rustless, and the paint in good condition. The lower and much rusted part of the column […]

From trust +? -less.

trustless (not comparable)

Lacking trust; untrusting.
(computing) Which does not need any trust.
A trustless network can run even if none of its nodes trusts another.
(obsolete) Untrustworthy; not deserving to be trusted.

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