Adjective airtight has 2 senses
  1. airtight, air-tight - having no weak points; "an airtight defense"; "an airtight argument"
    Antonym: vulnerable (indirect, via invulnerable)
  2. airtight, air-tight, gas-tight - not allowing air or gas to pass in or out
    Antonym: leaky (indirect, via tight)
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