不甚了了

duì cǐ wǒ bù shèn liǎo liǎo

对此我不甚了了。

I am not clear about it.

tā duì dāng dài wén xué bù shèn liǎo liǎo

他对当代文学不甚了了。

He did not keep up with current literature.

tā suí xīn suǒ yù de fàn fàn ér dú gù duì xǔ duō jīng diǎn shū jí bù shèn liǎo liǎo

他随心所欲地泛泛而读，故对许多经典书籍不甚了了。

His haphazard reading left him unacquainted with many classic books.