Definition of ときならぬ
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(adj-pn) unthought of; unexpected; unseasonal; unscheduled
「冬のソナタ」を例に挙げるまでもなく、いまや時ならぬ韓流ブームである。
You don't need to bring up "A Winter Sonata" to show that South Korean culture is having an unexpected boom in Japan.