不腆

bùtiǎn
  1. (Classical, self-depreciatory) not good; poor; insufficient
  2. not good; poor; insufficient

Wiktionary

Entry Composition

1 不 bù
  1. no; not so
  2. (bound form) not; un-
2 腆 tiǎn
  1. make strong (as liquors)
  2. virtuous