Synonyms for imprisonment

noun

1. Forcible detention

   incarceration, custody, confinement, captivity, isolation, duress, durance, bondage, thralldom, quarantine, limbo, immuration, remand; see also arrest 1, confinement 1, restraint 2.

   Antonyms freedom*, liberty, enlargement.

2. Placing in forcible detention

   confining, jailing, imprisoning, capturing, incarcerating, locking up, subjecting, enthralling, quarantining, immuring, detaining.

   Antonyms release*, liberating, discharge.