A pseudoconsensus is a false consensus, reached most commonly when members of a group feel they are expected to go along with the majority decision, as when the voting basis is a large supermajority

Supermajority

A supermajority or a qualified majority is a requirement for a proposal to gain a specified level or type of support which exceeds a simple majority . In some jurisdictions, for example, parliamentary procedure requires that any action that may alter the rights of the minority has a supermajority...

 and nothing can get done unless some of the members of the minority acquiesce. This can cause problems such as the Abilene paradox

Abilene paradox

The Abilene paradox is a paradox in which a group of people collectively decide on a course of action that is counter to the preferences of any of the individuals in the group. It involves a common breakdown of group communication in which each member mistakenly believes that their own preferences...

. Robert's Rules of Order

Robert's Rules of Order

Robert's Rules of Order is the short title of a book containing rules of order intended to be adopted as a parliamentary authority for use by a deliberative assembly written by Brig. Gen...

 notes that this was part of the impetus for switching from consensus to majority as the voting basis in the English House of Lords:

The book Creating a Life Together: Practical Tools to Grow Ecovillages identifies pseudoconsensus as a problem that can occur in communal environments with a consensus voting basis. Various forms of pseudoconsensus identified were the Big League Complex; Decision by Endurance; Everyone Decides Everything; and "I Block, I Block!"