Learner's definition of GUILTY
[also more guilty; most guilty]
1 : responsible for committing a crime or doing something bad or wrong
— often + of — sometimes used informally in a joking way
Do you think he's innocent or guilty?
Will the defendant plead guilty or not guilty?
Police have not been able to identify the guilty party. [=the person who committed the crime]
The state will prove that the defendants are guilty as charged. [=that they committed the crime they are accused of committing]
(informal) They're (as) guilty as sin. [=completely/very guilty]
2 a : showing that you know you have done something bad or wrong b : feeling bad because you have done something bad or wrong or because you believe you have done something bad or wrong