Unexpectedly
More Than Expected
adverb
Something that happens outside the plan is something that happens unexpectedly.
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.
日本語学習は私にはかなりハードルが高いんじゃないかと思っていたんですが、案外そうでもなかったです。
I thought learning Japanese would be very difficult for me, but unexpectedly, it actually wasn’t that bad.
日本人の魚好きの人でも、魚の小骨が苦手な人って案外多いんですよ。
Even among Japanese fish-lovers, there are a surprisingly large number of people who dislike small fish bones.
ご両親、全然そうは見えませんけど、案外お年を召してらっしゃるんですね。
Although they don't look it, your parents are older than I expected.