Difference between Propriety and Properness

PROPRIETY vs PROPERNESS: NOUN

Conformity to conventional standards of behavior or morality.
Socially correct usages or behaviors.
The quality of being proper; appropriateness.
Peculiar or exclusive right of possession; ownership; possession; property.
That which is proper or peculiar; property; peculiarity.
An estate; a holding.
Suitableness to an acknowledged or correct standard or rule; consonance with established principles, rules, or customs; fitness; justness; correctness.
Individuality; particular or proper state.
Individual right to hold property; ownership by personal title; property.
Correct or appropriate behavior
The quality or state of being proper; suitableness to an acknowledged or correct standard or rule; consonance with established principles, rules, or customs; fitness; appropriateness
Correctness in behaviour and morals
Fitness; the quality of being appropriate
That which is proper or peculiar; an inherent property or quality; peculiarity.

Decency, Fairness, Lawfulness, Permissibility, Validity, Veracity, Desirability, Prudence, Reasonableness, Integrity, Decorum, Legality, Appropriateness, Correctitude, Properness

Dowdiness, Impeccability, Amour propre, Equipoise, Wilfulness, Dandyism, Sensibleness, Morality, Fastidiousness, Fairness, Scrupulousness, Fitness, Probity, Correctitude, Propriety

Rightness, Suitability, Expediency, Correctness, Decency, Fairness, Validity, Veracity, Desirability, Prudence, Reasonableness, Integrity, Decorum, Correctitude, Properness

Priggishness, Tetchiness, Dowdiness, Impeccability, Amour propre, Wilfulness, Dandyism, Sensibleness, Morality, Fastidiousness, Fairness, Fitness, Probity, Correctitude, Propriety

The word is here employed with great propriety.
Cover of the Insurgent (image altered for propriety).
He hates those who are bold without propriety.
All such surmizes we may with propriety ignore.
Discussion is limited to the propriety of postponing.
Fulfilled direction use continual set him propriety continued.
Neither party questions the propriety of this holding.
IPAC transactions, without verifying propriety of the charge.
The Government Communication Propriety Guidance gives more detailed information on how to observe propriety within government communications.
When your parents are alive, serve them with propriety; when they die, bury them with propriety, and then worship them with propriety.

While they exude the air of properness, they are also very polite to others.
There are no restrictions beyond normal regulatory requirements related to capital sourcing, fit, and properness of the investors.
Nouns for proper include properness, propernesses and propers.