稳

settled / steady / stable

urgent / pressing / rapid / hurried / worried / to make (sb) anxious

cereal / grain

steady; stable; sedate; calm; (of sleep) sound; (of a transition) smooth

smooth / steady

steady / calm / unflustered

to be a cinch / in the bag / (of a person) confident of success

everything steady and stable (idiom); overcautious and unimaginary

lit. sitting at ease in a fishing boat despite wind and storm (idiom); to stay calm during tense situation / a cool head in a crisis

see 十拿九穩|十拿九稳[shi2 na2 jiu3 wen3]

monostable / single-side stable (relays)

able to keep a secret

trustworthy / dependable

quasi-stationary spiral structure QSSS (astrophysics)

to make progress while ensuring stability

bistable

(automotive) electronic stability program (ESP)

lit. to sit tight on the fishing terrace despite the storm (idiom) / fig. to stay calm in a tense situation

unstable / unsteady

unstable

turbulent

unstable equilibrium

instability