impenetrable

Main Entry:
impenetrable [im-pen-i-truh-buhl]
Part of Speech: adjective
Definition: dense
Synonyms: bulletproof, close, compact, firm, hard, hermetic, impassable, impermeable, impervious, inviolable, solid, substantial, thick, unpiercable
Antonyms: clear, penetrable, permeable, porous, soft, thin
Main Entry: adamant
Part of Speech: adjective
Definition: hard like rock
Synonyms: adamantine, flinty, impenetrable, indestructible, rock-hard, tough, unbreakable
Antonyms: flexible, soft, supple
Main Entry: airtight
Part of Speech: adjective
Definition: sealed
Synonyms: closed, impenetrable, impermeable, shut
Antonyms: loose, open, penetrable, permeable, unclosed, unsealed
Main Entry: arcane
Part of Speech: adjective
Definition: hidden, secret
Synonyms: cabalistic, esoteric, impenetrable, mysterious, mystic, occult, recondite, unaccountable, unknowable
Antonyms: common, commonplace, known, normal, outward
Main Entry: close
Part of Speech: adjective
Definition: dense, cramped
Synonyms: circumscribed, close-grained, compact, confined, confining, congested, consolidated, cropped, crowded, firm, impenetrable, impermeable, jam-packed, narrow, packed, restricted, short, solid, substantial, thick, tight
Antonyms: loose, open, uncramped
Main Entry: compact
Part of Speech: adjective
Definition: condensed
Synonyms: appressed, bunched, close, compressed, crowded, dense, firm, hard, impenetrable, impermeable, packed, pressed, solid, thick, tight
Notes: a compact is a formal agreement on rights and conduct, a treaty is a compact between nations, and a contract is a compact between two business entities
Antonyms: loose, slack, uncondensed
Main Entry: complex
Part of Speech: adjective
Definition: difficult to understand
Synonyms: Byzantine, Daedalean, Gordian, abstruse, bewildering, circuitous, complicated, confused, convoluted, crabbed, cryptic, discursive, disordered, disturbing, enigmatic, entangled, excursive, hidden, impenetrable, inscrutable, interwoven, intricate, involved, jumbled, knotted, knotty, labyrinthine, mazy, meandering, mingled, mixed, muddled, obscure, paradoxical, perplexing, puzzling, rambling, recondite, round-about, sinuous, snarled, sophisticated, tangled, tortuous, undecipherable, unfathomable, winding
Notes: something complex may be well-organized and logically constructed as well as subtle and intricate, while a thing that is complicated will have something irregular, perverse, asymmetrical in addition to fundamental intricacy; complex is more formal and technical (a problem in mathematics is complex) while something like personal life can be complicated
Antonyms: apparent, clear, direct, discernible, easy, evident, obvious, plain
Main Entry: convoluted
Part of Speech: adjective
Definition: complicated
Synonyms: baffling, complex, confused, elaborate, impenetrable, intricate, involved, labyrinthine, perplexing, puzzling, serpentine, tangled, tortuous
Antonyms: simple, straightforward
Main Entry: dense
Part of Speech: adjective
Definition: compressed, thick
Synonyms: close, close-knit, compact, condensed, crammed, crowded, heaped, heavy, impenetrable, jam-packed, jammed, massed, opaque, packed, packed like sardines, piled, solid, substantial, thickset
Antonyms: open, scattered, sparse, thin, uncompressed
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