We define and study in detail utraslow scaled Brownian motion (USBM) characterized by a time dependent diffusion coefficient of the form $D(t)\simeq 1/t$ . For unconfined motion the mean squared displacement (MSD) of USBM exhibits an ultraslow. logarithmic growth as function of time. in contrast to the conventional scaled Brownian motion. https://www.chiggate.com/biomat-sessions-sale/