impassable

adjective

im·​pass·​able (ˌ)im-ˈpa-sə-bəl 

variants or less commonly impassible

: incapable of being passed, traveled, crossed, or surmounted

impassability

(ˌ)im-ˌpa-sə-ˈbi-lə-tē 

noun

impassableness

(ˌ)im-ˈpa-sə-bəl-nəs 

noun

impassably

(ˌ)im-ˈpa-sə-blē 

adverb

Synonyms of impassable

• dense
• close
• impervious
• impenetrable
• impermeable
• impregnable
• frozen
• thick

Examples of impassable in a Sentence

The roads were made impassable by the flood.

the road was impassable until snowplows cleared it

Recent Examples on the Web

With the Strait of Hormuz still impassable and one-fifth of the world’s petroleum still locked up in the Persian Gulf, oil and gas giants have been reaping rewards from the supply crunch, sparking rebukes and criticisms from environmental and advocacy groups in the process. —Tristan Bove, Fortune, 28 Apr. 2026

Oil rose after efforts to resume peace talks over the Iran war stalled, with the Strait of Hormuz remaining virtually impassable, extending disruptions in the Middle East that have roiled global markets. —Bloomberg, 26 Apr. 2026

In North Aurora, the west side of the Fox River Trail was flooded and impassable under the State Street bridge, the news release on Friday said. —Aurora Beacon-News, Chicago Tribune, 24 Apr. 2026

Several streets have been left impassable with water deep enough to cover car bumpers and get inside people's homes. —Noel Brennan, CBS News, 20 Apr. 2026

Word History

First Known Use

1562, in the meaning defined above

Rhymes for impassable

• passable
• impassible
• irascible
• unsurpassable

Kids Definition

impassable

adjective

im·​pass·​able (ˈ)im-ˈpas-ə-bəl 

: impossible to pass, cross, or travel over

roads made impassable by the hurricane

impassability

(ˌ)im-ˌpas-ə-ˈbil-ət-ē 

noun