"persistence, insistence; over-eagerness," early 15c., from Old French importunité (14c.), from Latin importunitatem (nominative importunitas) "unsuitableness; unmannerliness, unreasonableness, incivility," from importunus "unfit, troublesome" (see importune).
his importunity left me no alternative but to agree
important
importation
importer
importunate
importune
importunity
impose
imposing
imposition
impossibilism
impossibility
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