stupid, dull, ignorant, doltish
褦 centers on a lack of mental sharpness: being stupid, dull, ignorant, or doltish.
褦 combines 衤 (clothing) with 能. The exact historical development is uncertain, but it likely relates to a garment or appearance associated with dullness or ignorance.
Picture a person wearing (衤) a ridiculous outfit that makes them look dull and ignorant (能 suggests ability, but here it's ironic: the clothes hide any real ability).
For ダイ, imagine a dull person trying to dye (ダイ) clothes but making a mess: dye -> ダイ, and the result is a stupid mistake.