孰
ジュク, いずれ, たれ

which, how, who

JLPT0 G13 S0 F5000

As per the right-hand element/享# as described in 惇 (swarm within an enclosure) + an abbreviated form of 巩 as described in 恐 (connect objects) → build a (curved) enclosing wall connecting the opposite ends of an enclosure. *Who*, *which*, and *in any case* are borrowed meanings.

[Full Kanji Etymology List]