done according to a systematic or established form of procedure. "a methodical approach to the evaluation of computer systems" synonyms: orderly , (well) ordered, (well) organized, (well) planned, efficient , businesslike , systematic , structured, logical , analytic , disciplined ; meticulous , punctilious "a methodical approach to the evaluation" (of a person) orderly or systematic in thought or behavior. Antonyms for methodical careless chaotic disorderly disorganized inefficient negligent thoughtless unmethodical