Paradox
noun, の adjective
It is reverse to the theory! What is going on? Things aren't right. There must be some kind of paradox going on, where all theories are reversed! D:
ぎゃくせつ
This is a jukugo word, which usually means on'yomi readings from the kanji. If you know the readings of your kanji you'll know how to read this as well.
逆説的に聞こえるかもしれないが、長い結婚生活を送ってきた年配の人達は、ちょっと違ったことに取り組むことは夫婦関係の刺激になると認めている。
It may sound paradoxical, but many long-married old people admit that some differences can spice up a relationship.