〜に足る
JLPT N1 Extremity and degreeworth; enough to
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に足る means sufficient or worthy enough to do something. Attach it to a verb's dictionary form or a noun. The negative に足りない means not worth. It is formal and used to judge whether something merits an action.
Examples
はにだ。 Kare wa shinrai suru ni taru jinbutsu da.
He is a person worthy of trust.
にないで、は。 Toru ni tarinai mondai de, nayamu hitsuyou wa nai.
There's no need to worry over such a trivial matter.