unsuitable
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unsuitable
Not appropriate for a particular purpose, task, or situation, or not possessing the necessary abilities.
Diese leichten Schuhe sind für eine Wanderung im Hochgebirge völlig ungeeignet.
These lightweight shoes are completely unsuitable for a hike in the high mountains.
The word consists of the prefix 'un-' and the adjective 'geeignet' (suitable). The prefix 'un-' negates the base word, so 'ungeeignet' literally means 'not suitable'.
Dieses Werkzeug ist für die Reparatur leider völlig ungeeignet.
Unfortunately, this tool is completely unsuitable for the repair.
To express what something is not suitable for, you almost always use the preposition 'für' (for) followed by the accusative. The structure is 'ungeeignet für etwas sein' (to be unsuitable for something).
Der Kandidat war für die verantwortungsvolle Position ungeeignet.
The candidate was unsuitable for the responsible position.
To emphasize that something does not fit at all, 'ungeeignet' (unsuitable) is often combined with adverbs such as 'völlig' (completely), 'absolut' (absolutely), or 'gänzlich' (entirely).
Seine scherzhafte Bemerkung war in der ernsten Situation absolut ungeeignet.
His joking remark was absolutely unsuitable in the serious situation.
wrong / false
'falsch' and 'ungeeignet' can both say that something does not fit a situation. 'falsch' is more general and can also mean that something is not true or goes against a rule. 'Ungeeignet' is more precise when it is about a purpose, a task, or a person. It says: something does not fit this goal, or someone does not have the necessary qualities. If you only want to say that a choice does not fit well, 'falsch' may be enough. If you want to emphasize the purpose, 'ungeeignet' is more natural and clearer.
Eva ist nach der Verletzung für das Turnier noch ungeeignet.
After the injury, Eva is still unsuitable for the tournament.
Für die Prüfung ist diese Lernmethode für sie falsch, weil sie dabei zu wenig übt.
For the exam, this study method is wrong for her because she does not practice enough with it.