dumb = not having the capability of thinking clearly about something for any number of reasons
stupid = having the capability of thinking clearly but choosing not to, thus getting in trouble, causing self-inflicting problems, or bringing destruction to a situation
dumb = not having the capability of thinking clearly about something for any number of reasons
stupid = having the capability of thinking clearly but choosing not to, thus getting in trouble, causing self-inflicting problems, or bringing destruction to a situation