厚かましい
あつかましい · atsukamashii · JLPT N2 · i-adj
impudent
🐘 厚 = thick: atsukamashii is being thick-skinned, so shameless
厚 (atsu-i) means thick. Someone 厚かましい has skin so thick that embarrassment can't get through, so they act brazen and impudent. English says the same thing with thick-skinned and thick-faced.
厚 — cliff 厂 + 子 over 日 (sun) component
Originally depicted a tall, thick mound or cliff (厂) with layered earth beneath, showing depth and substance. The core meaning 'thick' extended metaphorically to 'generous,' 'deep,' or 'kind-hearted.' Today 厚 commonly means thick (in dimension) or sincere/generous in character.