Or tsmithuth {tsem-ee-thooth'}; from tsamath; excision, i.e. Destruction; used only (adverbially) with prepositional prefix to extinction, i.e. Perpetually -- ever.
KJV: And if it be not redeemed within the space of a full year, then the house that is in the walled city shall be established for ever to him that bought it throughout his generations: it shall not go out in the jubile.
NASB: 'But if it is not bought back for him within the space of a full year, then the house that is in the walled city passes permanently to its purchaser throughout his generations; it does not revert in the jubilee.