"interesting" absorbing, engrossing, fascinating, riveting, gripping, compelling, compulsive, spellbinding, captivating, engaging, enthralling, entrancing, beguiling; appealing,attractive, amusing, entertaining,stimulating, thoughtprovoking,diverting, exciting, intriguing, action-packed;

informalunputdownable

I'll stick with strangely predictable as the most appropriate description of humans.

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