not enough; inadequate 不足的,不够的 there was insufficient evidence to convict him. 没有足够的证据证明他有罪。
派生 insufficiently adverb 语源
late Middle English (in the sense 'incapable, incompetent'): via Old French from late Latin insufficient- 'not sufficing', from in- 'not' + Latin sufficere (see suffice)