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“most inarable”
inarable (adjective), more inarable, most inarable
Relating to ground that is incapable of being plowed and cultivated to yield any normal plants: A desert is just one geographical area that is usually an inarable place to grow crops that can be utilized for human and animal consumption.
Since Mexico is primarily mountainous, it has been estimated that about 85% of the country is considered to be inarable.