Focus on Physical Bearing:
* Slouch: This emphasizes a lack of posture and grace.
* Awkwardness: This suggests a lack of ease and coordination.
* Untidiness: This focuses on a lack of order and neatness in appearance.
Focus on Social Conduct:
* Rudeness: This directly contrasts with the polite and respectful aspect of good deportment.
* Disrespect: This highlights a lack of consideration and consideration for others.
* Impropriety: This suggests behavior that is inappropriate or out of place in a given social setting.
* Boorishness: This emphasizes crude and insensitive behavior.
More general antonyms:
* Improper conduct: This broadly captures any behavior that is contrary to good deportment.
* Lack of refinement: This encompasses a lack of polish and grace in both appearance and behavior.
* Disorderliness: This signifies a lack of control and order in behavior.
The best antonym for "deportment" will depend on the specific context and what aspect of deportment you want to contrast.