における => in; at (place) N2
Scope
おまけに => A. In addition, B N2
(Not)only, (Not) even
けっか => as a result of; after ~ N3
Result
おもったら => just when; no sooner than ~ N2
Things do not match the prediction
~からとおもって => Because I think... N1
Base, base
(か)とおもうと / (か)とおもったら => just when; no sooner than ~ N2
Simultaneously
…とばかりおもっていた => Thought that ... N3
Speculation
…ものとおもっていた => Thought it was... N2
Vague
[決「けっ」]して~ない => Won’t, isn’t N3
Will, Decision, Doing
おまけに => to make matters worse; besides; what's more; in addition; on top of that​ N2
お => Prefix N5
Respectful, humble
まさか...とはおもわなかった => never thought that N3
Surprised