Chinese words with 怪 character meaning (HSK)

奇怪

QI2, GUAI4
strange, odd

怪不得

GUAI4, BU5, DE5
lit. you can't blame it!, no wonder!, so that's why!

难怪

NAN2, GUAI4
(it's) no wonder (that...), (it's) not surprising (that)

古怪

GU3, GUAI4
eccentric, grotesque, oddly, queer

责怪

ZE2, GUAI4
to blame, to rebuke