inevitable
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inevitable
In such a way that it cannot be avoided or prevented; bound to happen.
Nach den schweren Fehlern war die Niederlage der Mannschaft unausweichlich.
After the serious mistakes, the team's defeat was inevitable.
The word is logically built: 'un-' (not) + 'ausweichen' (to dodge, avoid) + '-lich' (adjective ending). So something is 'unausweichlich' (inevitable) if you cannot 'ausweichen' (avoid) it.
Man kann dem Schicksal nicht ausweichen.
You cannot escape fate.
The adjective is directly connected to the verb 'ausweichen' (to dodge, avoid), which means 'einer Sache aus dem Weg gehen' (to get out of the way of something / avoid something). If something is inevitable, you cannot get out of its way.
Der Radfahrer konnte dem Auto gerade noch ausweichen.
The cyclist was just able to swerve out of the way of the car.
'Unausweichlich' (inevitably) is very often used as an adverb to describe that an action or event is bound to take place. It often appears at the beginning of a sentence or in the middle of a sentence.
Diese Entwicklung führt unausweichlich zu höheren Preisen.
This development inevitably leads to higher prices.
necessary
'notwendig' and 'unausweichlich' can both describe that something has to happen because of the situation. 'unausweichlich' emphasizes that you cannot avoid it and that there is no real way to prevent something. It often sounds stronger than 'notwendig'. 'notwendig' can also simply mean that something is required. When talking about a fixed consequence or an upcoming step that cannot be escaped, 'unausweichlich' is especially suitable.
Wegen der hohen Kosten ist eine schwierige Entscheidung unausweichlich.
Because of the high costs, a difficult decision is inevitable.
Nach dem Fehler war eine neue Bestellung notwendig.
After the mistake, a new order was necessary.