hermetic
Most of the bodies were then placed in hermetically sealed caskets.
Some athletes have taken to living and sleeping in hermetically sealed tents or rooms that simulate high-altitude conditions.
We cannot hermetically seal our borders.
A cult of personality arises in a hermetically sealed environment, cut off from communication.
SMART Vocabulary: related words and phrases Locking and bolting
bar
batten
bolt
handcuff
latch
lock
lock (something) up
lock someone out
lock something away
lock something in
lockable
love lock
manacle
padlock
relock
self-locking
shut
shut someone away
under lock and keyidiom
unlockable
You can also find related words, phrases, and synonyms in the topics:
Lifestyles & their study
hermetically | American Dictionary
hermetically
adverb[ not gradable ]
us/hərˈmet̬·ɪk·li/
tightly closed so that air cannot enter or escape:
The space vehicle must be hermetically sealed.