快復[kaifuku] restoration
快い[kokoroyoi] pleasant
快楽[kairaku] pleasure
快楽主義[kairakushugi] hedonism
快濶[kaikatsu] cheerful

快感[kaikan] pleasant feeling
快挙[kaikyo] brilliant achievement
快哉[kaisai] joy
快作[kaisaku] splendid work
快事[kaiji] pleasure

陰晴[insei] unsettled (fine and cloudy) weather
快晴[kaisei] clear weather
気晴し[kibarashi] recreation
見晴し[miharashi] view
見晴す[miharasu] to command a view

五月晴[satsukibare] early-summer fine weather (during rainy season)
晴らす[harasu] to dispel
晴れる[hareru] to clear up
晴間[harema] break (in the weather, esp. rain or snow)