untidy (adj.)

early 13c., "untimely, unseasonable, unsuitable," from un- (1) "not" + tidy (adj.). Similar formation in 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.

untidy (v.)

"make untidy," 1891, from untidy (adj.). Related: Untidied; untidying.