鈍

to become insensitive; to become less perceptive; to lose one's touch; to get out of practice

to waver in one's resolution

dim-witted; airheaded; bird-brained; dim; dullard; blockheaded

Proverb; Suru verb - special class

poverty dulls the wit

slow-witted; dull; slow on the uptake

annealing

insensitive; thick-skinned

obtuse triangle

Computing

simulated annealing

Engineering

to anneal

Rare term

jet black

Dated term; Jocular, humorous term

uxoriousness; being easy on one's wife; man who is easy on his wife