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Webster 1913 Edition

Adj.

That may not be trusted; not worthy of trust; unfaithful.

–

Trust′less-ness

Noun.

Adj.

Not worthy of trust; unfaithful.

trustless ‎(not comparable)

Lacking trust; untrusting.
Untrustworthy; not deserving to be trusted.
- 1603, John Florio, translating Michel de Montaigne, Essayes, London: Edward Blount, OCLC 946730821, II.12:
  But thinks it not that […] the voice which the spirit uttereth when he is gone from man […] is a voice proceeding from the spirit which is in earthly, ignorant, and overclouded man; and therefore a trustles and not to be-believed voice?