Crude
Vulgar, Vulgarity
noun, な adjective
Things that are below normal products are the cheap knockoffs and bad quality items. These items are incredibly crude and vulgar in their manufacturing and design. So much vulgarity!
You haven't seen this reading for 下 yet (sorry there's so many for this kanji!) so here's a mnemonic to help you:
Those items are so crude that you can't even tell what they're supposed to be. Honestly they all just look like statues of lumpy geckos (げ). That says it's a lamp but it looks more like a gecko looking at the sky. That chair? Definitely a bunch of geckos having a pool party. Are you sure you didn't get this stuff from a weird gecko artist?
私は下品な英語の基本をマスターしました。
I've mastered the fundamentals of vulgar English.
はるか遠くから、下品な笑い声が聞こえてきた。
I heard a vulgar laugh from the distance.
あなたの下品なメールは会社に戻ってからじっくり読ませてもらいます。
I’ll carefully read your crude email for you when I get back to the office.