五臓六腑[gozouroppu] the internal organs
六腑[roppu] the six internal organs (large intestine, small intestine, gallbladder, stomach, san jiao, urinary bladder)
腑甲斐ない[fugainai] disappointing
腑抜け[funuke] fool
肺腑[haifu] lungs

腑に落ちない[funiochinai] cannot understand
臓腑[zoufu] entrails
胃の腑[inofu] stomach
腑抜ける[funukeru] to lose one's energy