This is the 4183rd most frequent Japanese word.
下手
Unskilled; bad at something.
Here, '下手 (heta)' is used to describe a skill or ability that one lacks or is not proficient in.
彼は泳ぐのが下手です。
He is bad at swimming.
In this sentence, '下手 (heta)' is utilized to comment on the proficiency in artistic creation, with a negation making it indicate proficiency.
この絵を描いた人は絵が下手ではありません。
The person who drew this picture is not bad at drawing.
Here, '下手 (heta)' is used to qualify the noun '嘘 (lie)' to indicate the lack of skill or proficiency in lying.