ungenau
inaccurate
Not exact, precise, or detailed; vague or only approximately correct.
Die Wettervorhersage für nächste Woche ist noch sehr ungenau.
The weather forecast for next week is still very inaccurate.

inaccurate
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inaccurate
Not exact, precise, or detailed; vague or only approximately correct.
Die Wettervorhersage für nächste Woche ist noch sehr ungenau.
The weather forecast for next week is still very inaccurate.

The adjective has a simple structure: it consists of the prefix 'un-', which expresses negation, and the adjective 'genau' (exact/precise). So it directly means 'not exact' or 'not precise'.
Deine Wegbeschreibung war leider etwas ungenau.
Unfortunately, your directions were somewhat inaccurate.
If 'ungenau' (inaccurate) refers to information, data, or statements, it means 'not precise'. If it refers to an action or a person, it means 'not careful' or 'careless'.
Die Schätzung der Kosten war ungenau und viel zu niedrig.
The estimate of the costs was inaccurate and much too low.
In the meaning 'not precise', 'ungenau' (inaccurate) is often combined with nouns that describe information or measurements. Typical examples are: 'eine ungenaue Angabe' (an inaccurate statement/detail), 'eine ungenaue Schätzung' (an inaccurate estimate), or 'eine ungenaue Erinnerung' (a vague memory).
Ich habe nur eine ungenaue Erinnerung an meine frühe Kindheit.
I have only a vague memory of my early childhood.
In the meaning 'careless', 'ungenau' (carelessly) is often used as an adverb to describe how an action is carried out. It then stands directly with the verb.
Wenn man das Gemüse so ungenau schneidet, wird es nicht gleichmäßig gar.
If you cut the vegetables so carelessly, they won't cook evenly.
exact / precise
'genau' and 'ungenau' are direct opposites when it comes to precision or care. 'genau' is used when a piece of information, measurement, or piece of work is exact and contains no important mistakes. 'ungenau' means that something is only approximately correct or was not done carefully enough. With numbers, times, descriptions, or instructions, 'genau' is important when people need to be able to rely on them. 'ungenau' fits when information is missing, vague, or makes mistakes possible.

Die Wegbeschreibung war ungenau, deshalb sind wir zweimal falsch abgebogen.
The directions were inaccurate, so we took the wrong turn twice.
Bitte schreib die Adresse genau auf, damit das Paket ankommt.
Please write down the address exactly so that the package arrives.