What is the meaning of 鈍?

slow, dull, sluggish

foolish, stupid, ridiculous

slowness, sluggishness

stupidity, absurdity

short for 鈍色 (nibiiro, “dark gray”)

blunt, dull

physically weak; spineless, cowardly

unskillful, unpolished

blunt bladed tool; bluntness

weak person; weakness, cowardice

inexperience; novice

mentally slow, dull-witted, stupid

physically slow, slow of action

dunce, dimwit; slowpoke

Source: wiktionary.org