noun
amateurish work; unprofessional craftsmanship
Refers to work done by an amateur, often implying a lack of skill or polish. Can be used self-deprecatingly.
これは素人細工だから、あまり期待しないでください。
This is amateur work, so please don't expect too much.
彼の作った棚は素人細工だけど、味がある。
The shelf he made is amateurish, but it has character.
Compound of 素人 (amateur) and 細工 (workmanship, craftsmanship).