Proper adjective - Being in agreement with the truth or a fact or a standard.
Usage example: there is really more than one proper way to pronounce that word in English
True is a synonym for proper in real topic. In some cases you can use "True" instead an adjective "Proper", when it comes to topics like quality, suitable.
True adjective - Being exactly as appears or as claimed.
Usage example: his claim that he's the heir to the throne of Greece can't be true
Both words in one sentence
- True Crime writers lap up the relatively few cases where some hospital worker has detected the scent and (this being the real world) been inspired to have proper lab tests done.
Source: Bitter Almonds
- However, it is true that money works like Gold and power works like Power, as do water (with the proper infrastructure) and waste management (again, with proper infrastructure).
Source: You Require More Vespene Gas
- Matilda ensures the children and the Baron to have good manners proper to a true aristocrat, not above giving them Denied Food as Punishment.
Source: Anime / Trapp Family Story
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Google Ngram Viewer shows how "proper" and "true" have occurred on timeline