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LingakuLingakuThe expression には及ばない has two distinct meanings depending on context:
When used with a verb (often in dictionary form or noun form), には及ばない conveys that something is unnecessary or that the listener need not go to the trouble of doing something. It is a formal and polite way of declining an offer or telling someone not to bother.
In this usage, the speaker is being humble or considerate, often used in business or formal situations. It is similar to 〜～までもない or 〜～にあたらない当たらない, but には及ばない carries a more refined, polite tone.
When used in this sense, the verb before には is typically in dictionary form, and the subject is often the action itself (e.g., 心配するには及ばない – "there is no need to worry").
When used with a noun (often a person or thing), には及ばない means that something or someone cannot match or does not measure up to the referent. It expresses that the subject falls short in comparison.
In this sense, it is similar to にはかなわない and emphasizes the superiority of the thing marked by には. The subject (the thing that falls short) is typically marked with は or が, or is implied from context.
Both usages are characteristic of formal written language and polite speech. The expression uses the literary negative form 及ばない from the verb およぶ及ぶ (to reach, to extend to). In very formal contexts, you may also see には及びません (polite form).