What is another word for airtight?

Need synonyms for airtight? Here's a list of similar words from our thesaurus that you can use instead.

Adjective
Having no weak points
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“Build an airtight business case for new IT investments.”
Adjective
Not allowing air to escape or pass through
“Store the biscuits in an airtight container.”
Adjective
Firm, strong, or substantial
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Adjective
Not lacking any part or component
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