才疏学浅 cái shū xué qiǎn ---- to have little talent and less learning . 才 cái ( talent , ability ) , 疏 shū( lack , scanty ) , 学xué( knowledge, learning ) , 浅 qiǎn ( shallow, insufficient ) . It is often used to self abase inferring knowledge or ability is still limited and further study should go on.