air-tight

• ⇰ So tight as to be impermeable to air or other gases; <as>as, an <ex>air-tight</ex> cylinder</as>; -- said of containers.
• ⇰ of such close construction as to have little leakage of air in or out; -- said of structures
• ⇰ so thoroughly convincing as to be insusceptible to doubt; having no apparent counterarguments; -- of arguments or assertions

• ⇰ A stove the draft of which can be almost entirely shut off.