Intact means whole and undamaged, with nothing broken off. The seal was intact, remains intact, survived intact.
It describes something that has been through danger and come out whole — which is why it is used after storms, accidents and reorganisations. It works for abstractions too: her reputation is intact, the agreement remains intact. It is not usually used before a noun: you say the box was intact rather than an intact box, though the second is not wrong. Note that there is no verb and no adverb — nothing is done intactly.
1adjectiveintactWhole and undamaged.
“The seal was intact and the contents were ruined anyway.”
intact is a state of wholeness.
Latin intactus is in-, not, plus tactus, touched — from tangere, to touch, the same verb behind contact, tangible and integrity. Something intact has not been touched, which is the strongest form of undamaged there is.
Proto-Indo-European
*teh₂g-
Latin
intactus
Middle French
intact
English, today
intact
From Middle French intact, from Latin intactus.
Etymology from Wiktionary, CC BY-SA