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Two good words I have learnt from Vocabulary Expander are "extempore" and "disabuse".


extempore adjective & adverb spoken or done without preparation: extempore public speaking | he recited the poem extempore.
disabuse verb persuade (someone) that an idea or belief is mistaken: he quickly disabused me of my fanciful notions.

SOANS, C. and STEVENSON, A. (eds.) 2005. Oxford Dictionary of English. Oxford: Oxford University Press.