expression
virtually nonexistent; negligible; as good as not there
Describes something that exists in name or form but is so ineffective or insignificant that it might as well not exist. Often used with rules, systems, or rights that are not enforced or respected.
この規則はあってなきがごとくだ。
This rule is as good as nonexistent.
彼の権限はあってなきがごときものだった。
His authority was virtually nonexistent.
expression
absolutely useless; completely ineffective
Emphasizes total lack of practical value or effect; often used when something fails to serve its intended purpose at all.
その説明書はあってなきがごときで、何の役にも立たなかった。
The manual was absolutely useless and didn't help at all.