intricate

American Heritage® Dictionary of the English Language, Fourth Edition

1. adj. Having many complexly arranged elements; elaborate. See Synonyms at elaborate.
2. adj. Solvable or comprehensible only with painstaking effort. See Synonyms at complex.

Century Dictionary and Cyclopedia

1. Perplexingly involved or entangled; hard to disentangle or disengage, or to trace out; complicated; obscure: as, an intricate knot; the intricate windings of a labyrinth; intricate accounts; the intricate plot of a tragedy.
2. In entomology, having unequal elevations and depressions placed irregularly and close together, but without running into each other: said of a sculptured surface. Synonyms Intricate, Complex, Complicated, Compound. Between complex and complicated there is the same difference as between complexity and complication. (See complication.) That is complex which is made up of many parts, whose relation is perhaps not easily comprehended; if this latter be true, especially if it be true to a marked degree, the thing is said to be complicated; it is also complicated if its parts have become entangled: as, the matter was still further complicated by their failure to protest against the seizure. That is intricate which, like a labyrinth, makes decision with regard to the right path or course to pursue difficult: as, an intricate question. Compound generally implies a mixture or union of parts in some way that makes a whole: as, a compound flower; compound motion; a compound idea; the word does not, like the others, suggest difficulty in comprehension. See implicate.
3. To render intricate or involved; make perplexing or obscure.

Wiktionary

1. v. intransitive To become enmeshed or entangled.
2. v. transitive To enmesh or entangle: to cause to intricate.
3. adj. Having a great deal of fine detail or complexity.

GNU Webster's 1913

1. adj. Entangled; involved; perplexed; complicated; difficult to understand, follow, arrange, or adjust
2. v. obsolete To entangle; to involve; to make perplexing.

WordNet 3.0

1. adj. having many complexly arranged elements; elaborate.