巖
ガン, いわ, いわお, けわ.しい, よし

rock, crag, boulder

JLPT0 G13 S0 F5000

As per 嚴# (rugged side of a mountain) + 山 mountain → rugged *cliff* → *rock*; *crag*; *steep*; *precipitous*. 巖 was devised to replace 嚴 after 嚴 acquired its associated meanings.

[Full Kanji Etymology List]