unreceptive to new ideas or information; not open to any agreement.

(topology) A set whose complement is open.

crowded tightly together

(simile, colloquial) miserly, tight, or secretive

An enclosed precinct surrounding a cathedral.

(algebra, field theory, of a field) Which contains as an element every root of every nonconstant univariate polynomial definable over it (i.e., over said field).

plural of closed caption

plural of closed book

plural of close encounter

plural of cathedral close