虚
キョ, コ, むな.しい, うつ.ろ

void, emptiness, unpreparedness, crack, fissure, untruth

JLPT1 G7 S11 F1454

An abbreviated form# of 盧 (sunken) + an element deriving from a seal inscription form of 丘 (geologic basin) → basin notably sunken in the middle (e.g., for the foundation of a building; compare 亞) → *hollow*; *empty* → *false*; *untrue*; *fool*.

[Full Kanji Etymology List]