Innocuous or inert? I'm trying to find the right word for Bitcoin character of money...

I'm trying to find the word to describe Bitcoin. It's a synonym to neutral or inert. Something that I read in the Bitcoin Standard in which it says that Bitcoin doesn't have any yield or anything that could qualify it as an 'investment'. I remember Saifedean using another word, but for the life of me I cannot remember what it was.

I guess I'll have to read the whole book again. Uh! Poor me! I have to read, that awesome book? Once again?

But I think it's a good message to send to people that look at Bitcoin as an investment. It is not. It fills the purpose of money: 'store of value' and 'medium of exchange'.