1) Laconic
Using only a few words to say something.
“His laconic reply suggested a lack of interest in the topic.”
The word laconic comes from the ancient Greek region of Laconia, where the Spartans were known for speaking in a concise and blunt manner.

2) Profligacy
The act of spending money or using something in a way that wastes it and is not wise.
“The company’s financial troubles were largely due to the CEO’s profligacy in spending on unnecessary luxury items.”

3) Idiosyncrasy
An unusual habit of a person.
“She often cracks her knuckles when she’s speaking – it’s one of her little idiosyncrasies.”

4) Quirk
An aspect of somebody’s character or behavior that is strange.
“You’ll soon get used to the boss’s little quirks.”

5) Quiescent
In a state or period of inactivity or dormancy.
“The stock had been quiescent for the previous two weeks, drifting down gently.”