Words which I use incorrectly

An incomplete list...

crepuscular
Means: of or pertaining to evening.
I use it to mean: slow. 'Oh, that tram's going past in a crepuscular way.'

avuncular
Means: Of or relating to an uncle, like an uncle.
I use it to mean: Friendly.

mercenary
Means: Working or acting merely for gain.
I use it to mean: Indiscriminate.

afternoon
Means: afternoon.
I use it to mean: midday, afternoon, evening, or night.

gynaecological
Means: branch of medical science relating to the functions and diseases peculiar to women, especially those relating to the reproductive organs.
I use it to mean: anything relating to the body.

In general I find that long obscure words are incredibly useful, since most people don't trouble to throw them into a conversation and therefore most people aren't sure what they mean anyway. So when you do throw them into a conversation, their meaning largely depends on their function in the sentence you are saying, and the context.

Not sure how I started using 'afternoon' indiscriminately, though. (Or should I say, not sure how I started being so mercenary with my use of the word 'afternoon'?)

Should I be doing this? No. Will I keep on doing this? Hell, yes.