Proper
Proper adjective - Following the established traditions of refined society and good taste.
Trustworthy and proper are semantically related. In some cases you can use "Trustworthy" instead an adjective "Proper".
Trustworthy
Trustworthy adjective - Worthy of one's trust.
Proper and trustworthy are semantically related. Sometimes you can use "Proper" instead an adjective "Trustworthy".
Mutual synonyms
Both words in one sentence
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The proper course of action is to converse with him, use the various insults the game offers, and then warp out of the fight to repeat the cycle until it dawns on him that Ur-Quan don't insult opponents that way, so you're actually trustworthy.
Source: Sheathe Your Sword -
Inn Security: Averted for the most part: you sleep in your own house (most of the time) and a fairly trustworthy fox provides healing services in the dungeon proper (for an outrageous price, which becomes less outrageous as you build your link with him).
Source: Video Game / Persona 4
Cite this Source
Trustworthy and Proper. (2016). Retrieved 2026, July 28, from https://thesaurus.plus/related/proper/trustworthy
Proper & Trustworthy. N.p., 2016. Web. 28 Jul. 2026. <https://thesaurus.plus/related/proper/trustworthy>.
Trustworthy or Proper. 2016. Accessed July 28, 2026. https://thesaurus.plus/related/proper/trustworthy.
Google Ngram Viewer shows how "proper" and "trustworthy" have occurred on timeline