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agnostic one who believes it is impossible to know anything about the existence or nonexistence of God or about the essential nature of things beyond the material universe. [1/4 definitions]
airlift the systematic transportation of people or supplies by air when ground routes are impossible or dangerous to use, esp. in a battle zone or during an emergency. [1/2 definitions]
Babel according to the Old Testament, a tower built by the descendants of Noah, which was to reach heaven, a plan frustrated by God, who made communication among workmen impossible by creating a confusion of languages.
bottomless impossible to reach an understanding of; unfathomable. [1/3 definitions]
Catch-22 a situation in which one is trapped between two logically contradictory rules or regulations that make successful action impossible.
conundrum a puzzle or problem with a difficult or impossible solution. [1/2 definitions]
cul-de-sac a condition in which further progress is impossible. [1/2 definitions]
defy to challenge or dare (someone) to do something very difficult or impossible. [1/3 definitions]
fireproof difficult or impossible to damage or destroy with fire. [1/2 definitions]
forbid to obstruct or make impossible. [1/4 definitions]
illegible difficult or impossible to read or decipher.
immeasurable impossible to measure; without limit.
impassable impossible to go past, through, over, or around.
impenetrable impossible to penetrate or enter; impervious. [3 definitions]
impossibility the state or quality of being impossible. [2 definitions]
impossibly in an impossible way. [1/3 definitions]
inaccessible hard or impossible to reach, approach, or attain.
incredible difficult or impossible to believe. [1/2 definitions]
indeterminable impossible to establish or measure; not ascertainable. [2 definitions]
indigestible impossible or not easy to digest or absorb.
indivisible of a number, impossible to divide exactly. [1/2 definitions]