濃い
こい · koi · JLPT N3 · i-adj
strong
☕ Sounds like koi: koi carp are known for their strong, dense colours
濃 = 氵 water + 農 farming: water thickened by farm soil. Use it for strong coffee (濃いコーヒー), deep colours or heavy flavours. Its opposite is 薄い (usui), meaning thin or weak.