What does unsealable mean?
Unsealable is an adjective meaning not capable of being sealed shut. It commonly describes containers, envelopes, closures, and packages that, once opened, cannot be closed again in a way that restores their original integrity. This makes the word particularly useful in forensic, legal, security, and product-packaging contexts, where reopening an item must be evident. An unsealable package is not necessarily impossible to open; rather, opening it may make it impossible to reseal, often because a tamper-evident strip, seal, or locking mechanism has been broken. For this reason, unsealable should be distinguished from tamper-evident, which describes evidence of interference rather than the inability to close an item again. The word is uncommon in everyday conversation but established in formal and technical usage. It should not be confused with unseal, the verb for opening a sealed object, or with resealable, its common opposite.
adjectiveNot capable of being sealed shut or closed again, especially after being opened.
- Incapable of being sealed shut or resealed, especially after opening.
"The evidence envelope was designed to be unsealable, ensuring that opening it would leave clear evidence of interference."
"Once the security strip had been broken, the package was unsealable and the tampering was immediately apparent."
"The manufacturer uses an unsealable container to ensure that consumers cannot close and conceal previously opened products."
Unsealable does not mean “able to unseal”; it means “not capable of being sealed”—the opposite of resealable.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does unsealable come from?
Unsealable is formed from seal using the negative prefix un- and the adjectival suffix -able. Seal ultimately derives through Old French from the Latin sigillum, meaning a seal or device used to authenticate a document. Its modern use is especially associated with packaging, security closures, and containers designed to reveal interference.
Related word forms
How unsealable is actually used
Relatively uncommon and mainly formal or technical, especially in legal, forensic, security, and packaging contexts. It does not necessarily mean that something is impossible to open; the intended sense is often that it cannot be closed or sealed again afterwards.
Easily confused with unsealable
Unseal is a verb meaning to open or remove the seal from something, whereas unsealable is an adjective describing something that cannot be sealed shut or resealed.