unavoidable
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unavoidable
In such a way that it cannot be avoided or prevented; bound to happen.
Aufgrund des starken Schneefalls waren Verspätungen im Zugverkehr unvermeidlich.
Due to the heavy snowfall, delays in train traffic were unavoidable.
The word is clearly structured: the prefix 'un-' means 'not', the stem comes from the verb 'vermeiden' (to avoid), and the ending '-lich' makes it an adjective. So it literally means 'not avoidable'.
Eine Preiserhöhung war leider unvermeidlich.
Unfortunately, a price increase was unavoidable.
'Unvermeidlich' (unavoidably / inevitably) can also be used as an adverb to express that something inevitably happens. It then usually stands directly next to the verb or at the beginning of the sentence.
Diese Entscheidung führt unvermeidlich zu Konflikten.
This decision inevitably leads to conflicts.
The adjective is often combined with nouns that describe a result or consequence. Typical collocations are 'unvermeidliche Folgen' (unavoidable consequences), 'unvermeidliche Konsequenzen' (unavoidable consequences), or 'ein unvermeidliches Ergebnis' (an unavoidable result).
Der Klimawandel hat unvermeidliche Folgen für die Landwirtschaft.
Climate change has unavoidable consequences for agriculture.
necessary
'notwendig' and 'unvermeidlich' can both mean that something has to happen because of the circumstances. 'unvermeidlich' emphasizes that something cannot be prevented. The word is especially suitable for consequences, problems, or events. 'notwendig' can also describe such a consequence, but it is broader and can also simply mean that something is needed. If you want to say that something cannot be stopped, 'unvermeidlich' is usually clearer.
Wegen des starken Schnees war die Sperrung der Straße unvermeidlich.
Because of the heavy snow, the road closure was unavoidable.
Nach der neuen Regel ist eine Änderung des Plans notwendig.
After the new rule, a change to the plan is necessary.