堅 means “firm, solid, steady”

かたい · katai

Also: strict, hard, tough

Kun'yomi (Japanese reading)
かたい
On'yomi (Chinese reading)
ケン

JLPT N1 · Taught in secondary school · 12 strokes

The story

A watchful eye (臣) and a hand (又) pressed down on earth (土): picture packing soil until it is rock-hard. 堅い is firm and solid, 堅実 steady and sound, and 中堅 the mid-career backbone of a company.

Used in 堅い (katai, firm/solid), 中堅 (chuuken, backbone/mid-level), and 堅実 (kenjitsu, steady/reliable)

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Readings from KANJIDIC2, © EDRDG, CC BY-SA.