the GNU version of the Collaborative International Dictionary of English
adj. Of, pertaining to, or resembling, the stern old Roman, Cato the Censor; severe; inflexible.
The Century Dictionary and Cyclopedia
Pertaining to or resembling either Cato the censor (died 149 b. c.) or Cato Uticensis (95-46 b. c.), Romans, both remarkable for severity of manners and morals; hence, grave; severe; inflexible.
Word Usage
"Her brother had a more catonian look; thick locks of coarse black hair kept well with his russet, sunburnt face, and his lips, if by nothing else, were swollen with large quids of tobacco."