Find Antonyms

porous Antonyms

Opposite of porous

Because the opposite of porous shifts with each meaning, the 10 antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
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• adjective (Context 1)

Having minute spaces or holes through which liquid or air may pass; permeable to fluids.

Usage Example

"Sandstone is a highly nonporous rock that holds large amounts of groundwater."

Strongest
nonporous
impervious
impermeable
Strong
watertight
airtight
dense

• adjective (Context 2)

Not secure or well-protected; allowing people or things to pass or cross easily (especially of a border or defense).

Usage Example

"Customs officials struggled to monitor smuggling across the country's long, impenetrable border."

Strongest
impenetrable
secure
Strong
impregnable
airtight
sealed

Similar words to porous

Words similar to porous shift depending on context. Common synonyms include:

permeable
pervious
penetrable
absorbent
leaky
spongy
unsecured
vulnerable
See all synonyms of porous

• Nearby Words

pornographically
porny
porosity
porous
porousness
porridge
port

Cite this Entry

Wordmom. (2026). Antonyms for Porous. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/porous
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