85. A slow and easy motion of a MODU in a seaway is an indication of a __________.

A slow, easy motion indicates a small metacentric height (GM). This is because a small GM results in a long roll period and a 'tender' vessel, contrasting with the quick, snappy roll of a stiff vessel (large GM). Righting arm (GZ) and center of gravity (KG) are related to stability but do not directly explain the observed slow motion.