| a. | 1. | So tight as to be impermeable to air or other gases; |
| 2. | of such close construction as to have little leakage of air in or out; - said of structures | |
| 3. | so thoroughly convincing as to be insusceptible to doubt; having no apparent counterarguments; - of arguments or assertions | |
| n. | 1. | A stove the draft of which can be almost entirely shut off. |
| Adj. | 1. | air-tight - having no weak points; "an airtight defense"; "an airtight argument" Synonyms: airtight |
| 2. | air-tight - not allowing air or gas to pass in or out |