What it means
に足る expresses that someone or something is worthy of a particular action, evaluation, trust, or consideration, or that it is sufficient for a stated purpose. It is a formal, literary construction commonly found in written evaluations and serious discussion. With a noun, the noun identifies the standard or action for which the subject is worthy; with a dictionary-form verb, the verb states the action or evaluation that the subject merits. The construction often carries a stronger sense of adequacy or merit than an ordinary statement of sufficiency.
Usage note
に足る is formal and is uncommon in casual conversation. Do not confuse it with に足りる, which more directly means that something is sufficient or reaches a required amount; に足る often emphasizes worthiness or merit.
Example sentences
この研究は、将来の医療政策を見直すに足る重要な資料である。
This research is important enough to warrant a review of future medical policy.