臆説[okusetsu] hypothesis
臆念[okunen] something one always remembers
臆病[okubyou] cowardice
臆面[okumen] shy face
臆面もない[okumenmonai] bold

臆面もなく[okumenmonaku] boldly
剛臆[gouoku] bravery and cowardice
臆測[okusoku] guess
臆断[okudan] jumping to hasty conclusions
臆する[okusuru] to be hesitant