inability
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inability
The lack of the necessary strength, knowledge, competence, or means to do something specific.
Seine Unfähigkeit, zuzuhören, macht jede Diskussion mit ihm schwierig.
His inability to listen makes every discussion with him difficult.
incapacity
In the legal or medical sense, the state of not being legally or physically able to perform certain actions (e.g., incapacity for work, legal incapacity).
Nach dem Unfall attestierte ihm der Arzt eine vorübergehende Arbeitsunfähigkeit.
After the accident, the doctor certified him as temporarily unable to work.
The word is made up of the negating prefix 'un-' and the noun 'Fähigkeit' (ability). So it literally describes the absence or opposite of an ability.
Seine Unfähigkeit, Entscheidungen zu treffen, lähmt das ganze Team.
His inability to make decisions paralyzes the whole team.
'Unfähigkeit' is very often expanded with an infinitive construction using 'zu' in order to explain what the inability consists of. The structure is: 'die Unfähigkeit, etwas zu tun' (the inability to do something).
Ich bin frustriert über meine Unfähigkeit, diese Sprache fließend zu sprechen.
I am frustrated by my inability to speak this language fluently.
In general usage, 'Unfähigkeit' is often combined with verbs like 'zeigen' (to show) or 'beweisen' (to prove). Adjectives like 'völlig' (complete) or 'offensichtlich' (obvious) can intensify the statement.
Der Politiker offenbarte seine völlige Unfähigkeit in der Krise.
The politician revealed his complete inability in the crisis.
In legal or medical contexts, 'Unfähigkeit' is often part of technical terms such as 'Arbeitsunfähigkeit' (incapacity for work) or 'Geschäftsunfähigkeit' (legal incapacity). These have a very precise, legally defined meaning.
Wegen seiner Krankheit erhielt er eine Bescheinigung über seine Arbeitsunfähigkeit.
Because of his illness, he received a certificate confirming his incapacity for work.
incompetence
Both words describe a deficiency that prevents someone from carrying out a task properly. „Inkompetenz“ refers especially to a lack of knowledge or skill in a particular area of responsibility, while „Unfähigkeit“ can also mean a general or situational lack of ability or strength. For incorrect work in a professional setting, „Inkompetenz“ is therefore particularly appropriate.
Seine Unfähigkeit, den schweren Karton zu tragen, lag an fehlender Kraft.
His inability to carry the heavy box was due to a lack of strength.
Die Inkompetenz des Technikers zeigte sich in den vielen Fehlern des Berichts.
The technician’s incompetence was evident in the report’s many errors.
