Synonyms of airtight in English:

airtight


See US English definition of airtight

See UK English definition of airtight

See Spanish definition of hermético

adjective

1‘an airtight container’

SYNONYMS
sealed, closed, shut tight, tight, impermeable, hermetically sealed
watertight, waterproof
ANTONYMS

leaky

2‘he had an airtight alibi’

SYNONYMS
indisputable, unquestionable, incontrovertible, undeniable, incontestable, irrefutable, unassailable, beyond dispute, beyond question, beyond doubt
foolproof, sound, flawless, watertight, conclusive, without loopholes
ANTONYMS

flawed