adjective, un·ti·di·er, un·ti·di·est.
- not tidy or neat; slovenly; disordered: an untidy room; an untidy person.
- not well-organized or carried out: an untidy plan.
verb (used with object), un·ti·died, un·ti·dy·ing.
- to mess up; disorder; disarrange: The guests untidied the room.
adjective -dier or -diest
- not neat; slovenly
verb -dies, -dying or -died
- (tr) to make untidy
adj.early 13c., “untimely, unseasonable, unsuitable,” from un- (1) “not” + tidy (adj.). Cf. West Frisian ontidich, Middle Dutch ontidich, Dutch ontijdig, Old High German unzitich, German unzeitig, Norwegian utidig “untimely, unseasonable, unfavorable.” Meaning “poorly cared for, not neat” is recorded from mid-14c.