Y'know, sometimes I'll like a word just because of the sound of it, or the spelling, or because of what it means, or because of everything about it, or because of a particular usage of it, say in the media or something. So many reasons to like words.... Anyway, I won't remember all my favorite words, so I'll just add them whenever they occur to me. (Also check out this list.)

adorkable
aesthetic
anachronism / anachronistic
antidisestablishmentarianism (for its having been used by the series Recess)
apotheosis (particularly for Sewer Urchin having used it in The Tick)
archaic
bizarre
blatherskite (because DuckTales)
chief
chaos
coincidence
colloquial / colloquialism
copacetic
disambiguation (a popular word over at Wikipedia)
disseminate
eccentric
eclectic
eldritch
electroencephalographic technologist (for its having been used in an old McDonalds commercial)
ellipsis
epiphany
esoteric
ethereal
fjords (particularly for Slartibartfast's use of it in The Hitchhiker's Guide to the Galaxy)
genre
glacier
glockenspiel
gossamer
hierarchy / hierarchal
hmmm...
homage
indubitably (partly for its having been used in "Crispy Critters" cereal commercials)
ineffable
karma
kismet
macabre
maelstrom
meander
melancholy
miscellaneous
non-corporeal (mainly for describing certain Star Trek aliens)
non sequitur
nostalgia
objective & subjective
penultimate
petrichor (because I'm glad a word exists for the thing it describes)
presume (for it allows you to assume without making an ass of u and me)
proselytize (don't really care for the meaning, though)
quaint
quintessential
quirky
rathskeller
redonkulous (though if you spell it "ridonkulous," that's okay too)
retcon
retroactive
rutabega (proper spelling is "rutabaga," but I prefer it with an "e")
sanguine
segue
serendipity / serendipitous
stream-of-consciousness
surreal
vagaries
vague
vellichor (because I'm glad a word exists for the thing it describes)
vicariously
yoink!