intricacy, n. [complication], [entanglement], [complexity].
intricate, a. [complicated], entangled, involved, labyrinthian, [mazy].
intrigue, n. [conspiracy], machination, cabal, [plot]; amour (illicit love affair), liaison.
intrigue, v. [plot], [scheme], machinate, cabal.
intriguer, n. machinator, [plotter], [schemer], Figaro, intrigant, intrigante ([female]).
intriguing, a. [scheming], Machiavelian, [wily].
intrinsic, a. [inherent], [innate], [real], [genuine]. Antonym: extrinsic.
introduction, n. [preface], proem, exordium, prelude, prolegomenon, prologue, foreword; presentation; interpolation interposition, initiation.
introductory, a. preliminary, proemial, prefatory.
intrude, v. [infringe], [invade], [encroach], obtrude, interlope.