暗い[kurai] dark
暗がり[kuragari] darkness
暗に[anni] implicitly
暗やみ[kurayami] darkness
暗うつ[anutsu] gloom

暗雲[anun] dark clouds
暗褐色[ankasshoku] dark brown
暗きょ[ankyo] subterranean drain
暗君[ankun] foolish ruler
暗号[angou] code

暗欝[anutsu] gloom
陰欝[inutsu] gloom
欝積[usseki] accumulation (e.g. of emotions, grievances, etc.)
憂欝症[yuuutsushou] melancholia
躁欝病[souutsubyou] manic depression

欝血[ukketsu] blood congestion
欝蒼[ussou] thick
欝憤[uppun] resentment
悒欝[yuuutsu] depression
欝金[ukon] turmeric (Curcuma domestica)