Random disorder effects of an hydrophobic aerosil on the order and dynamics of the 3 beta-DOXYL-5 alpha-cholestane spin probe in the liquid crystal 4-n-pentyl-4'-cyanobiphenyl (5CB) were studied using the ESR technique. Increasing the aerosil concentration up to 10 wt% does not change the nematic-isotropic transition temperature but decreases the probe order parameter. The dynamics in the isotropic phase is of Arrhenius type and essentially independent of the concentration. Deviations from this behavior are clearly observed in the nematic phase even at 1 wt% of aerosil and are well represented by a Vogel-Fulcher-Tainmann type law, suggesting that a glass-like behavior can be induced by a very small amount of random disorder.