Definition of unpreposterous in English:
unpreposterous
adjective ˌʌnprɪˈpɒst(ə)rəs
Origin
Early 17th century; earliest use found in Joshua Sylvester (d. 1618), poet and translator. From un- + preposterous.
Definition of unpreposterous in US English:
unpreposterous
adjectiveˌʌnprɪˈpɒst(ə)rəs
Origin
Early 17th century; earliest use found in Joshua Sylvester (d. 1618), poet and translator. From un- + preposterous.