na-adjective, noun which may take the genitive case particle 'no', noun
more than enough; ample; exhaustive
Emphasizes that something is fully sufficient or even excessive; stronger than 十分. Used in both attributive (十二分な/十二分の) and adverbial (十二分に) forms.
See also: 十分
準備は十二分に整っている。
Preparations are more than sufficient.
彼の説明は十二分だった。
His explanation was more than enough.
十二分な注意を払って作業を進めた。
We proceeded with the work, paying exhaustive attention.