air-tight

Definitions of air-tight
1

adj not allowing air or gas to pass in or out

Synonyms:
airtight, gas-tight
tight
of such close construction as to be impermeable

adj having no weak points

Synonyms:
airtight
invulnerable
immune to attack; impregnable

Sign up, it's free!

Whether you're a student, an educator, or a lifelong learner, Vocabulary.com can put you on the path to systematic vocabulary improvement.