(obsolete) Unavailing; ineffective. / Not available.

(US, history) A communist who operated underground and was therefore not available for a political leadership position.

plural of unavailable

The quality of being unavailable.

Fruitless, futile, useless.

The state of being unavailable

plural of unavailability

In an unavailable manner.

(India) Of which one does not avail oneself; unused.

Used other than figuratively or idiomatically: see unavailable, energy. / (physics) Energy that is converted by an irreversible process into a form that is unavailable to do work