Antonyms for methodical

organized:

disorganized, inefficient, unsystematic, negligent, unscrupulous, unmethodical, careless, chaotic, thoughtless, disorderly.

noun:

unordered, unsystematic, nonsystematic, planless, shambolic, Immethodical, disorganised, hit-or-miss, patternless.

n.:

unorganised, unorganized.