Antonyms of adj air-tight

2 senses of air-tight

Sense 1
airtight, air-tight -- (having no weak points; "an airtight defense"; "an airtight argument")

INDIRECT (VIA invulnerable) -> vulnerable -- (susceptible to attack; "a vulnerable bridge")

Sense 2
airtight, air-tight, gas-tight -- (not allowing air or gas to pass in or out)

INDIRECT (VIA tight) -> leaky -- (permitting the unwanted passage of fluids or gases ; "a leaky roof"; "a leaky defense system")
                                                                         

Similarity of adj air-tight

2 senses of air-tight

Sense 1
airtight, air-tight -- (having no weak points; "an airtight defense"; "an airtight argument")
       => invulnerable (vs. vulnerable) -- (immune to attack; impregnable; "gunners raked the beach from invulnerable positions on the cliffs")

Sense 2
airtight, air-tight, gas-tight -- (not allowing air or gas to pass in or out)
       => tight (vs. leaky) -- (of such close construction as to be impermeable; "a tight roof"; "warm in our tight little house")

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