未熟 みじゅく
mijuku

Noun
na-Adjective

1. unripe; green; immature

Noun
na-Adjective

2. immature; inexperienced; unskilled; green

かれのフランス 知識 ちしき未熟 みじゅくだ。
kareno furansugono chishikiwa mijukuda.
His knowledge of French is poor.