unordentlich
messy / untidy
Being in a state of disorder; not tidied up or clean. Often refers to rooms, desks, or the arrangement of things.
Sein Zimmer ist immer furchtbar unordentlich.
His room is always terribly messy.

messy / untidy
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messy / untidy
Being in a state of disorder; not tidied up or clean. Often refers to rooms, desks, or the arrangement of things.
Sein Zimmer ist immer furchtbar unordentlich.
His room is always terribly messy.

The word is made up of the negating prefix 'un-' and the adjective 'ordentlich' (tidy/neat). So it literally means 'not tidy' or 'not neat'.
Auf dem Schreibtisch lagen die Papiere in einem unordentlichen Haufen.
The papers were lying on the desk in a messy pile.
The noun that 'unordentlich' (messy/untidy) describes reveals the exact meaning. Does it refer to a place (room, desk), a person ('er ist unordentlich' — he is messy), or appearance (hair, clothing)?
Sein unordentlicher Schreibtisch spiegelt sein kreatives Chaos wider.
His messy desk reflects his creative chaos.
When referring to places or things, 'unordentlich' (messy/untidy) is often combined with words like 'Zimmer' (room), 'Wohnung' (apartment), 'Schreibtisch' (desk), or 'Haufen' (pile).
Ich muss dringend meine unordentliche Wohnung aufräumen.
I urgently need to tidy up my messy apartment.
Pay attention to the difference: 'Sein Zimmer ist unordentlich' (His room is messy) describes the state of a place. 'Er ist unordentlich' (He is messy) describes a trait or habit of the person.
Obwohl sie sehr unordentlich ist, ist ihr Büro immer sauber.
Although she is very messy, her office is always clean.
neat / proper
'ordentlich' and 'unordentlich' are direct opposites. Use 'ordentlich' when something is tidy, clean, or well organized. Use 'unordentlich' when things are lying around, something does not look clean, or a person often does not keep things in order. With clothing or hair, 'unordentlich' can also mean that someone looks unkempt. 'ordentlich' then suggests a neat, well-groomed impression.

Nach dem Training sah seine Kleidung ziemlich unordentlich aus.
After training, his clothes looked quite messy.
Für den Besuch hat die Ärztin ihr Büro ordentlich vorbereitet.
The doctor prepared her office neatly for the visit.