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Use "undutifulness" in a sentence
"He might, indeed, if he had learnt his trade in that singular criticism of Shakespeare, which has decided that Hamlet was written for a warning to the irresolute, and Coriolanus as a lesson to the proud, persuade himself that the poem was written to show how great passion leads to undutifulness and selfishness."
"Osborne broke out into a rhapsody of self-praise and imprecations; — by the first, excusing himself to his own conscience for his conduct; by the second, exaggerating the undutifulness of George."
"Get down the round-hand scrawls of your son who has half broken your heart with selfish undutifulness since; or a parcel of your own, breathing endless ardour and love eternal, which were sent back by your mistress when she married the Nabob — your mistress for whom you now care no more than for Queen Elizabeth."