noun, noun which may take the genitive case particle 'no'
Describes something without a lid or roof, such as an open-top vehicle or an uncovered container. Often used in technical or descriptive contexts.
無蓋のトラックで荷物を運ぶ。
Transport goods in an open truck.
無蓋の容器に液体を入れてはいけない。
Do not put liquid in an uncovered container.