na-adjective, noun
Describes something large in scale or bulk, or coarse rather than fine in texture or granularity. Very common in 粗大ごみ, meaning bulky waste.
粗大ごみは月に一度しか回収されない。
Bulky waste is collected only once a month.
試料の中に粗大な粒子が混じっていた。
Coarse particles were mixed into the sample.