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intricate: intricate: see trick
intrinsic: intrinsic: [15] The Latin adverb intrinsecus meant ‘on the inside’. It was formed from *intrim ‘inward’, an unrecorded derivative of the adverb intrā ‘within’, and secus ‘alongside’ (a relative of English second, sect, sequel, etc). In the post-classical period it came to be used as an adjective, meaning ‘inward’, and it passed into Old French as intrinseque ‘inner, internal’.

This general concrete sense accompanied the word into English, but it now survives only as an anatomical term, meaning ‘situated within a body part’. The abstract sense ‘inherent’, now the adjective’s main meaning, developed in the 17th century. The derivation of the antonym extrinsic [16] is precisely parallel, with Latin extrā ‘outside’ taking the place of intrā.
=> extrinsic, second, sect, sequel
intricacy (n.): c. 1600, from intricate + -acy.
intricate (adj.): early 15c., from Latin intricatus "entangled," past participle of intricare "to entangle, perplex, embarrass," from in- "in" (see in- (2)) + tricae (plural) "perplexities, hindrances, toys, tricks," of uncertain origin (compare extricate). Related: Intricately.
intrigante (n.): "women given to intrigue," 1806, from fem. of French intrigant, from Italian intrigante, present participle of intrigare (see intrigue).
intrigue (v.): 1610s, "to trick, deceive, cheat" (earlier entriken, late 14c.), from French intriguer (16c.), from Italian intrigare "to plot, meddle," from Latin intricare "entangle" (see intricate). Meaning "to plot or scheme" first recorded 1714; that of "to excite curiosity" is from 1894. Related: Intrigued; intriguing (1680s, "plotting, scheming;" meaning "exciting curiosity" is from 1909).
intrigue (n.): 1640s, probably from intrigue (v.).
intrinsic (adj.): late 15c., "interior, inward, internal," from Middle French intrinsèque "inner" (13c.), from Medieval Latin intrinsecus "interior, internal," from Latin intrinsecus (adv.) "inwardly, on the inside," from intra "within" (see intra-) + secus "alongside," originally "following" (related to sequi "to follow;" see sequel). Meaning "belonging to the nature of a thing" is from 1640s. Related: Intrinsicly.