The word "errantly" refers to behavior that is incorrect or misguided. Synonyms for this term include improperly, wrongly, erroneously, mistakenly, faultily, inappropriately, inaccurately, and incorrectly. Each of these words suggests that something was done in a way that was not correct or did not follow accepted standards. Other possible synonyms for "errantly" might include recklessly, carelessly, or negligently, which imply a greater degree of irresponsibility or disregard for consequences. Regardless of the specific word chosen, each synonym for "errantly" suggests that something was done in a way that was not ideal or desirable.