Etymology
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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.

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Definitions of untidy

untidy (adj.)
not neat and tidy;
an untidy living room
untidy and casual about money
careless and untidy in her personal habits
From wordnet.princeton.edu