Sealed (8)
'sealed' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for airtight that I've seen before include "Without weak points" , "not letting out a breath?" , "Not allowing gas to pass" , "Hermetically sealed" , "Sure" .)
'sealed' is the definition.
(similar in meaning)
This is all the clue.
(Other definitions for unopened that I've seen before include "Still closed" , "Remaining sealed" , "Having held onto seal" , "barred" , "shut" .)