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得る

can; to be able to; is possible to~

得ない

unable to; cannot; it is not possible to ~

…ず、…ず

No... but also no...

ざるを得ない

cannot help (doing); have no choice but to ~

...ず

without doing

... はずみ....

So

ずに

without doing ~

～ににあわず (に似合わず )

～Different from

～をきんじえない（～を禁じ得ない）

can't help but; can't refrain from ~

ざるを[得「え」]ない

Only A is left to do/can be done

～によらず     

regardless of ~

～Vず して

without doing ~