1. the quality of being proper, correct, or appropriate
2. conformity to accepted standards of behavior or morals

Examples

• She questioned the properness of wearing jeans to the formal dinner.
• The properness of his conduct at the meeting impressed everyone.
• They debated the properness of the new policy changes.
• Her sense of properness prevented her from gossiping about colleagues.
• The properness of the language used in the report was important.
• He always maintained strict properness in his professional relationships.