Is Unmaintained One Word?

Unmaintained is an adjective. The adjective is the word that accompanies the noun to determine or qualify it.

Is chairman one word or two?

noun, plural chair·men. the presiding officer of a meeting, committee, board, etc.

Is right now one or two words?

"Right now" is frequently used in preference to "now" in most cases in speech today. The same applies to "right here", "right there", right then", etc.