What do you call that when there is no obvious forced moved?

There is a term that is used for the state of a game when there is no obvious move to be made.

At the end of a sequence of moves when there is no, piece to defend or take....

What's that called? Thanks!

Unclear? Sometimes, if there are lots of possibilities, an infinite sign is used in notation ∞. 

Thank you, but I remember reading in an article here on chess.com, which I can't locate again.  When considering candidate moves... During sequences in the game you get a series of moves that are obvious, but then at the end of that, there is a move that is no longer obvious.  That state has a name.  The game reaches a state of ___________

 No obvious move to make and nothing to capture are different situations... sometimes the same, sometimes not.

I think Dan Heisman had a word for a position with no more forcing moves... I forgot the word he used though. The word that's stuck in my head is "quintessence"... which is wrong, but I can't think of the right one

Equilibrium? 

critical moment?.... some critical moments have a forced response, but it is sometimes not obvious

Correct....the term is quiescence!

 https://www.chess.com/article/view/get-better-at-chess-for-everyone-comparison

Thanks!

zugzwang.

Thank you, the wrong word blocked my mind from finding the right one, very annoying.

Not Zugzwang, newengland7; I read a good book by Ronan Bennett called 'Zugzwang' set in 1914 Russia, in St Petersburg. Zugzwang is defined as 'used in chess to describe a deadly position in whick a player is obliged to move, but every move only makes his position even worse'. There is even a chess game written into the book. I recommend it.