下手くそ (hetakuso) Japanese meaning: unskilled | KotomoraHe's terrible at singing.
Sorry for my crappy handwriting.
Usage patterns
〈事〉が下手くそだto be terrible at something
下手くそな〈物〉a lousy/awful (thing, e.g. drawing, cooking)
This is a terrible drawing.
〈動詞〉のが下手くそto be bad at doing (some action)