improperness

Breach of decorum

Improperness is the quality of being improper—unsuitable, incorrect, or violating standards of decency or etiquette.

The word is rare; impropriety is the standard noun for this concept.

The improperness of his conduct was obvious to everyone.

unsuitability

inappropriateness

Lack of suitability

inaptness · wrongness · inapplicability · mismatch · discordance · unseemliness · ineligibility · inadequacy · irrelevance · unacceptability

indecency

lewdness

Crude sexual indecency

profanity · crudeness · bawdiness · ribaldry · salaciousness · lasciviousness · smut · filthiness · coarseness · explicitness

misconduct

malfeasance

Unlawful act by officeholder

unethical behavior · dishonesty · fraud · abuse · exploitation · violation · transgression · breach of trust · misappropriation · scandal

disrespect

rudeness

Disrespectful social behavior

discourtesy · impoliteness · incivility · disregard · contempt · disdain · insubordination · defiance · mockery · derision

Opposites
social propriety and decorum

impropernesspropriety

Correctness of conduct

properness · decorum · seemliness · decency · respectability

correctness and suitability

impropernessfitness

Good physical shape

suitability · appropriateness · correctness · aptness · fittingness

Family

proper, property, appropriate, improper, propriety, improperly, impropriety, proprietary, appropriateness

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Used worldwide · Timeless · Abstract · Everyday, not technical · Rated G