Most underused words...

[Simon-JG-hr]

At the very least it would confound and befuddle the proletariat - that's always fun (if a little too easy).

Indubitably.

[Aussiewaz]

Indubitably.

Unquestionably! LOL.

[monkey66]

Hypermalifastication

[Aussiewaz]

Hypermalifastication

I'm sure you could get ten years for that! Masticating a mal-aligned hyperbole. Pervert! LMAO.

[Pandyboy]

Not enough people say Toodle Pip when they say goodbye.

[r0lan6]

"no..." when I'm at work.

[patrickspark]

"it was my own fault"

[EugeneSax]

spade

...the word has fallen into apparant dis-use.

I am given to understand it's still in fairly common usage in the world of bridge.

[Simon-JG-hr]

Not enough people say Toodle Pip when they say goodbye.

I'm a proud 'toodle-pipper' when the mood takes my fancy. I've also been known to inadvertantly blurt out 'tally ho' and 'chocks away' - though the latter two are more regularly emplyed in crab bashing.

(For the uninitiated, a 'crab' is someone in the Royal Air Farce ).

[Pipe Dude]

Loquacious.
Tintinabulation.
Discombobulated.
Flauccinauccinihilipilification.
Pneumonoultramicroscopicsilicovolcanoconiosis.

[cohibaIV]

'I Love you'

[Simon-JG-hr]

Not forgetting the greatest word of lust there is: lascivious - the type of thoughts which I have far too often...