na-adjective, noun
Describes something that is roughly made or still in an early, unpolished state. Can refer to physical objects, plans, or a person's character or skills.
彼の演技はまだ粗削りだが、才能を感じる。
His acting is still rough, but I can sense his talent.
この計画は粗削りなので、もっと細部を詰める必要がある。
This plan is still rough, so we need to work out the details more.