mindmap root((迟钝)) stupid implies a slow-witted or dazed state of mind that may be either congenital or temporary: you're too ~ to know what is good for you. dull suggests a slow or sluggish mind such as results from disease, depression or shock: monotonous work that left his mind ~. dense implies a thickheaded imperviousness to ideas or impressions: was too ~ to take a hint. crass suggests a grossness of mind precluding discrimination or delicacy: a ~, materialistic people. dumb applies to an exasperating obtuseness or lack of comprehension: too ~ to figure out what is going on.