airtight


adjective

  1. preventing the entrance or escape of air or gas.
  2. having no weak points or openings of which an opponent may take advantage: an airtight contract.

adjective

  1. not permitting the passage of air either in or out
  2. having no weak points; rigid or unassailablethis categorization is hardly airtight
adj.

also air-tight, “impervious to air,” 1760, from air (n.1) + tight. Figurative sense of “incontrovertible” (of arguments, alabis, etc.) is from 1929.

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