There are some words that are indicative of madness. Or, at the very least, warning signs of a highly atypical, chaotic, and unusual (in the bad way) brain.
For instance, no one in their right minds in this day and age would ever say "whilst".
Honestly, you've got something wrong with you if you use that word in any sort of conversation.
I passed Kristen the beans as I chattered, "Well, I was out shopping with Jenny and we saw the cutest boy ever! I mean, this guy had a bod you could eat off of, if you know what I mean. Anyway, so, whilst Jen went off into H and M, the boy comes over to talk to me and I just die!"
The only way that that "whilst" could sound remotely natural would be if Morgan Freeman was narrating that (go on. Take a minute and imagine him saying that scene). But then Morgan Freeman can make anything sound awesome, even if it's gibberish.
"Dog goes 'woof', cat goes 'meow', bird goes 'tweet' and mouse goes 'squeak'. Cow goes 'moo', frog goes 'croak' and the elephant goes 'toot'. Ducks say 'quack', fish go 'blub', and the seal goes 'ow ow ow'."
Even though Morgan Freeman is awesome (as proven above), you shouldn't have to rely on Morgan to make your story sound natural. So stop saying "whilst" for goodness' sake*.
*Exceptions to these terms are for crazy characters who think they live in the Medieval Ages (i.e. A crazy who thinks he's Sir Lancelot), the actual Sir Lancelot from Medieval times who hitched a ride in the TARDIS/Delorian and ended up in modern times, or Sir Lancelot in the time period he belongs in. And that's it. No exceptions. Unless you want me to smack you upside the head whilst screaming obscenities at the top of my lungs.
