[juujian]

Works for Ubuntu, too. My Colemak self can only get fluffy (6) from the front row, that's the longest word. Middle row really shines though, I can get hardheartedness (15) or assassinations (14).

[tiltowait]

Interesting that your dictionary doesn't have "tenderheartedness", which is two letters longer.

[jmholla]

"tenderheartedness" uses every row, not one row.

[cbsks]

Not on a Colmak keyboard

[seabass-labrax]

Gulp, fluffy puppy pug! Yup. Fly, ugly pup, fly.

I note that hardheartedness and hotheadedness threaten the darnedest nonstandard assassinations. Such sordidness!