Definition of worse:
(adv) :
(comparative of `ill') in a less effective or successful or desirable manner
"he did worse on the second exam"
(adj) :
(comparative of `bad') inferior to another in quality or condition or desirability; changed for the worse in health or fitness
"this road is worse than the first one we took"
(n) :
something inferior in quality or condition or effect
"for better or for worse"