airtight

Definition of Airtight in English :

1. air-tight, airtight

having no weak points

Example Sentences:
'an airtight defense'
'an airtight argument'

2. air-tight, airtight, gas-tight

not allowing air or gas to pass in or out

WordNet Lexical Database for English. Princeton University. 2010.

Airtight

adjective

1.

not permitting the passage of air either in or out

2.

having no weak points; rigid or unassailable

this categorization is hardly airtight

adjective

1.

too tight for air or gas to enter or escape

2.

having no flaws or weaknesses

an airtight alibi

3.

giving no opening for attack; invulnerable

an airtight defense

adj.

1. Impermeable by air.

2. Having no weak points; sound: an airtight excuse.