What is another word for airtightly?

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

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