I like the words antidisestablishmentarianism, mofusul, and communality.
Accept the past. Live for the present. Look forward to the future. Robot Fusion
"As our island of knowledge grows, so does the shore of our ignorance." John Wheeler
"[A] scientist looking at nonscientific problems is just as dumb as the next guy." Richard Feynman
"[P]etabytes of  data is not the same thing as understanding emergent mechanisms and structures." Jim Crutchfield
Zymurgy- it was the last word in the dictionary for most of my life (I think it has been replaces since)
Facetious - vowels in order in which they appear in the alphabet
Serendipitous - it just sounds good.
Regardless - because I must wipe out the use of 'ir'regardless.