halfassism 

A Condition resulting in or involving doing everything half ass.

I swear my son got his halfassism from his dad. It must be genetic!

halfassism by 3 Sunshines May 29, 2016

halfassitude 

One who has half-ass attitude towards things, usually due to lack of interest.

I do not understand the halfassitude shown by my younger brother, especially when doing things not for himself.

halfassitude by Jonathan Archer March 16, 2005

Halfassidness 

1.) The quality of being half-assed; the resultant perception of an individual--or group of individuals--being slothful, ignorant or apathetic.

2.) The essence of a result or solution that has been completed to a less than acceptable level of quality. Mediocrity.

Thanks to the halfassidness of the staff at Best Buy, I decided to buy my new TV elsewhere.

After the case cracked twice on her vibrator, it was apparent that the quality control department at Electra-Schlong, Inc. was fraught with halfassidness.

Halfassidness by Turbine Monkey January 21, 2009