Their relationship was of an indeterminably vague nature.他们的关系不清不楚,非常暧昧....

adv.无法决定地...

indeterminably的音标：indeterminably的英式发音音标为：[ɪndɪ'tɜ:mɪnəblɪ]indeterminably的美式发音音标为：[ɪndɪ'tɜmɪnəblɪ]...