Fifteen years after "Fatal Attraction," director Adrian Lyne is again probing the murky depths of high-stakes infidelity with the visually stylish but numbingly sullen "Unfaithful." Using Claude Chabrol's "La Femme Infidele" as his primary source of inspiration, Lyne's portrait of an affluent, seemingly happily married woman (the always reliable Diane Lane) who nevertheless has a sordid affair with a young, French, cocksure book-collector (Olivier Martinez), ultimately has all the intrigue and allure of one of those International Coffee commercials. Credible character motivation is a big problem, not to mention some eye-rollingly bad dialogue and an all-too-apparent two-hour-plus running time.

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