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1.
Less than a half-wit. Would require two to make a half-wit, an idiot.
He's a total fool - a complete quarter-wit.
See moron, idio..
1.
Not promoting health; unwholesome: an insalubrious environment.
In`sa*lu"bri*ous, a. Pref. in- not + salubrious: cf. L. insalubris..