very interesting; of absorbing interest; having a keen interest (in); being immensely curious (about)
half out of interest; mostly out of curiosity
of no interest; not interested
to attract interest; to arouse someone's interest
(just) out of curiosity; (just) in order to satisfy one's curiosity; aimed chiefly at amusing; sensational (e.g. magazine)
to arouse someone's interest; to whet (appetite); to be appealing; to be intriguing; to be fascinating
uninteresting; tending to spoil the fun (pleasure) (of); throwing a wet blanket (on)