Grossly underused words

As an army person I hear clusterfuck all the time, as well as other colourful words and phrases such as 'disappear into a red mist', 'dog' (referring to a food), 'digging with your eyelids', etc.

I have to agree 'augment' is a beautiful word, with references to music and linguistics. Luckily it hasn't been abused in drab corporate-speak - which bastardized 'roadmap', 'moving forward', 'we're committed to...', 'core', 'milestone'.

Among some of the words I'd like to see more often (off the top of my head), cantankerous, lacuna, augment, dictum, expunge, profligate.. there are a lot more, but I'm having a brain fart as of now.

Jam it back in, in the dark.