a. 不熟练的

n. 生手

[ adj ]
lacking professional skill or expertise
<adj.all>
a very amateurish jobinexpert but conscientious efforts
an unskilled painting

Inexpert \In`ex*pert"\, a. [L. inexpertus inexperienced: cf. F.
inexpert. See {In-} not, and {Expert}.]
1. Destitute of experience or of much experience. [Obs.]
--Milton.

2. Not expert; not skilled; destitute of knowledge or
dexterity derived from practice. --Akenside.