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

適わない[kanawanai] no match for
快適[kaiteki] pleasant
快適さ[kaitekisa] amenity
適う[kanau] to come true (wish)
適える[kanaeru] to grant (request, wish)

好適[kouteki] ideal
最適[saiteki] optimum
最適化[saitekika] optimization
素適[suteki] lovely
適確[tekkaku] precise