Disorderly, a.
1. Not in order; marked by disorder; disarranged; immethodical; as, the books and papers are in a disorderly state.
2. Not acting in an orderly way, as the functions of the body or mind.
3. Not complying with the restraints of order and law; tumultuous; unruly; lawless; turbulent; as, disorderly people; disorderly assemblies.
4. (Law)
2 more senses
Offensive to good morals and public decency; notoriously offensive; as, a disorderly house.
Syn. -- Irregular; immethodical; confused; tumultuous; inordinate; intemperate; unruly; lawless; vicious.
1 other Webster entry under this spelling
Disorderly, adv.
In a disorderly manner; without law or order; irregularly; confusedly. Withdraw yourselves from every brother that walketh disorderly. 2 Thess. iii. 6. Savages fighting disorderly with stones. Sir W. Raleigh.
Shades of meaning
Fernald lists disorderly only as an antonym, under neat.
He lists it without comment; the entries above explain its neighbors.