2 sentences for 不足 (bù​zú — not worth)

1. 这种事见多了也就不足为怪了。

   zhèi zhǒng shì jiàn duō le yě jiù bù​zú wéi guài le.

   Once you've seen enough of this kind of thing, it's no longer surprising.

   Source: Dong Chinese Dictionary

2. 这点小伤不足挂齿，你不必担心。

   zhè diǎn xiǎo shāng bù​zú guà​chǐ, nǐ bù​bì dān​xīn.

   This minor injury is not worth mentioning; you needn't worry.

   Source: Dong Chinese Dictionary