Etymology
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trusty (adj.)

early 13c., "trusting," from trust (n.) + -y (2). Old English expressed this idea by treowful. Meaning "reliable, to be counted on" is from early 14c. The noun meaning "trustworthy person" is from 1570s; specifically as "a prisoner granted special privileges as reward for good conduct" by 1855.

updated on February 19, 2014

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Definitions of trusty from WordNet
1
trusty (n.)
a convict who is considered trustworthy and granted special privileges;
2
trusty (adj.)
worthy of trust or belief;
Synonyms: trustworthy
From wordnet.princeton.edu, not affiliated with etymonline.