Grammar Info
N1 Lesson 7: 6/17

に足(た)りない
to not be worthy, to not be enough, to not be sufficient, to lack

に足らない is an older variant.

Structure
Verb + に足りない
Details
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使用域 敬語
Information
  • [Used to express that something does not meet needs, is insufficient, or not worthy of something. Generally used in the set expression: 取るに足りない meaning “of little importance” or ”worthless”. It is also used with 恐れる and various words expressing trust.]
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他人(たにん)から見(み)たら取(と)るに足(た)りない小(ちい)さな貝(かい)にすぎないが、私(わたし)にとってはあの日(ひ)のお土産(みやげ)だ。
From another person's perspective, it is nothing but a worthless, small shell, yet for me, it is a souvenir of that day.
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《記事(きじ)》失敗(しっぱい)など全(まった)く恐(おそ)れるに足(た)りないなぜなら、間違(まちが)えたり、失敗(しっぱい)することは、人(ひと)として成長(せいちょう)するからである
Article: The likes of failure are not worth fearing at all. It is because of mistakes, that we grow as people.
恐れるに足らない is an older variant that can be sometimes seen in the literature.
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ロジャー・キントの言葉(ことば)は一(ひと)つとして信(しん)じるに足(た)りないことだ。
Not even one word of Roger Kint is worth believing.
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