A literary, old-fashioned word meaning troubled and restless — not peaceful inside. It is not about noise, which is the trap the spelling sets. An unquiet mind is a mind that will not settle: worried, turning things over, unable to rest. You also meet an unquiet heart, an unquiet night, an unquiet spirit, an unquiet sleep. Because it describes something that will not rest, it has a strong home in ghost stories: 'the unquiet dead' are spirits who cannot lie still in their graves. That phrase is where many readers first meet the word. It can also stretch outwards from a person to a time or a place — an unquiet period in the country's history, an unquiet border — meaning unsettled, with trouble not far away. You will find it in novels, poetry, memoirs and history writing, almost never in conversation. Modern speakers say 'restless', 'troubled', 'uneasy', or 'anxious'. Reach for 'unquiet' when you want the older, heavier sound; it makes a sentence feel like it belongs to another century, and used carelessly it can sound like you are trying too hard. There is a rare verb use too, meaning to disturb or unsettle someone, but you are very unlikely to need it and even less likely to see it.

（心）不平靜的、忐忑不安的；（時局）動盪不安的