having an opening obstructed. [WordNet 1.5]
of a curve or surface: having no end points or boundary curves; of a set: having members that can be produced by a specific operation on other members of the same set; of an interval: containing both its endpoints. [WordNet 1.5]
Being in a position to obstruct an opening; -- especially of doors. [WordNet 1.5]
having skin drawn so as to obstruct the opening; -- used of mouth or eyes. Opposite of open. [WordNet 1.5]
requiring union membership; -- of a workplace; as, a closed shop. [WordNet 1.5]
closed with shutters. [WordNet 1.5]
hidden from the public; as, a closed ballot. [WordNet 1.5]
not open to the general public; as, a closed meeting. [WordNet 1.5]
unsympathetic; -- of a person's attitude. [WordNet 1.5]
surrounded by walls. [WordNet 1.5]
made compact by bending or doubling over; as, a closed map. [WordNet 1.5]
closed or fastened with or as if with buttons. [WordNet 1.5]
not engaged in activity; -- of an organization or business establishment. [WordNet 1.5]

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OXFORD DICTIONARY

closed, adj.
1 not giving access; shut.
2 (of a shop etc.) having ceased business temporarily.
3 (of a society, system, etc.) self-contained; not communicating with others.
4 (of a sport etc.) restricted to specified competitors etc.

Idiom

closed book see BOOK. closed-circuit (of television) transmitted by wires to a restricted set of receivers. closed-end having a predetermined extent (cf. open-ended). closed season US = close season (see CLOSE(1)). closed shop
1 a place of work etc. where all employees must belong to an agreed trade union.
2 this system. closed syllable a syllable ending in a consonant.

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THESAURUS

closed

arcane, authoritarian, beyond reach, bigot, bigoted, blank, blind, blind-alley, borne, cabalistic, cecal, censored, choked, choked off, classified, close, closed forever to, closed to, concealed, constricted, contracted, cramped, creedbound, cryptic, dark, dead, dead-end, deaf, deaf to reason, enigmatic, esoteric, fanatical, hermetic, hidden, hidebound, hush-hush, illiberal, impenetrable, impersuadable, impersuasible, impervious, inaccessible, inflexible, inhospitable, insular, latent, little, little-minded, lost to, mean, mean-minded, mean-spirited, mysterious, narrow, narrow-hearted, narrow-minded, narrow-souled, narrow-spirited, nearsighted, obstinate, occult, out of reach, parochial, petty, provincial, purblind, restricted, secret, shortsighted, shut, small, small-minded, smothered, squeezed shut, stifled, straitlaced, strangulated, stuffy, suppressed, top secret, ulterior, un-come-at-able, unaccessible, unamenable, unapproachable, unattainable, unavailable, unbreatheable, uncatholic, uncharitable, uncordial, under security, under wraps, undisclosable, undisclosed, undiscoverable, undivulgable, undivulged, unfriendly, ungenerous, ungettable, ungracious, unhospitable, unimpressionable, uninfluenceable, unliberal, unmovable, unneighborly, unobtainable, unopen, unopened, unpersuadable, unpliable, unprocurable, unreachable, unreceptive, unresponsive, unrevealable, unrevealed, unsecurable, unspoken, unsuggestible, unsusceptible, unswayable, untellable, untold, unutterable, unuttered, unvented, unventilated, unwhisperable, unyielding

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ROGET THESAURUS

closed

Closure

N closure, occlusion, blockade, shutting up, obstruction, embolus, contraction, infarction, constipation, obstipation, blind alley, blind corner, keddah, cul-de-sac, caecum, imperforation, imperviousness, impermeability, stopper, closed, shut, operculated, unopened, unpierced, imporous, caecal, closable, imperforate, impervious, impermeable, impenetrable, impassable, unpassable, invious, pathless, wayless, untrodden, untrod, unventilated, air tight, water tight, hermetically sealed, tight, snug.

For further exploring for "closed" in Webster Dictionary Online