Slow of understanding; wanting readiness of apprehension; stupid; doltish; blockish.

Slow in action; sluggish; unready; awkward.

To make dull, stupid, or sluggish; to stupefy, as the senses, the feelings, the perceptions, and the like.

To become dull or stupid.

a. unfortunate b. slow witted

slow to learn or understand; lacking intellectual acuity; "so dense he never understands anything I say to him"; "never met anyone quite so dim"; "although dull at classical learning, at mathematics he was uncommonly quick"- Thackeray; "dumb officials make some really dumb decisions"; "he was either normally stupid or being deliberately obtuse"; "worked with the slow students"

(of business) not active or brisk; "business is dull (or slow)"; "a sluggish market"