御中[onaka] stomach
御話中[ohanashichuu] busy (phone)
アル中[aruchuu] alcoholism
π中間子[paichuukanshi] pi meson
暗中[anchuu] in the dark

暗中摸索[anchuumosaku] groping in the dark
意中[ichuu] one's mind
意中の女[ichuunoonna] sweetheart
井の中の蛙大海を知らず[inonakanokawazutaikaiwoshirazu] parochial
一日中[ichinichijuu] all day long

ご多忙中[gotabouchuu] in the midst of your work (often used as a formal phrase in business letters, etc.)
多忙[tabou] busy
忙がしい[sewashii] busy
繁忙[hanbou] pressure of business
忙殺[bousatsu] being extremely busy

忙しげ[sewashige] looking busy
気忙しい[kizewashii] restless
忙中[bouchuu] (in the midst of) busyness
心忙しい[kokorozewashii] restless
仕事で忙しい[shigotodeisogashii] busy with one's work

烏有に帰する[uyuunikisuru] to be reduced to ashes
烏有先生[uyuusensei] fictitious person
恩が有る[ongaaru] to be in one's debt
価値有る[kachiaru] valuable
含有[ganyuu] contain

含有量[ganyuuryou] content (of a mineral, etc.)
享有[kyouyuu] possession
共有[kyouyuu] share
共有財産[kyouyuuzaisan] community property
共有者[kyouyuusha] joint owners

偸閑[akarasama] plain
等閑[naozari] neglect
安閑[ankan] easygoingness
一閑張り[ikkanbari] lacquered papier-mache
閑人[kanjin] man of leisure

閑暇[kanka] leisure
閑居[kankyo] quiet and secluded life
閑散[kansan] deserted (esp. store, market, town, streets)
閑寂[kanjaku] quiet
閑職[kanshoku] leisurely post