The term "half-assed" is colloquial slang used to describe something that is done poorly or carelessly. Some synonyms for this term include "slack," "shoddy," "sloppy," "incomplete," and "unprofessional." Other phrases that can be used in place of "half-assed" include "botched," "rushed," "haphazard," and "slapdash." Using more polished language, one could say that something was "improperly executed" or "lacking in attention to detail." No matter which synonym is utilized, the meaning remains the same; something was not done to the best of someone's ability.