堅 - strict, hard, solid

firm (market); bullish

adhering to (a view, policy, etc.); sticking to; holding fast to; steadfastly maintaining

sound; sure; safe; secure; trustworthy; reliable; solid

solid; strong; firm

nucleus; backbone; mainstay; key figure

steady; sound; stable; safe (e.g. business); reliable; trustworthy; solid

hard wood

strong fortress

stronghold

nut

solid; strong; sturdy; durable; stout

perseverance