in the first place
https://gyazo.com/0a3612ee044906a0671c67e40e7593d7
〖順序〗⦅書⦆ (最初の論点を導入して)まず第一に[始めに] (!この意ではfirstlyと交換可能) . e.g. political reality was not quite that simple—in the first place, divisions existed within the parties.
〖非難・いらだち〗⦅話⦆ (結果に対する話し手の非難・いらだち・強い疑念を示して)そもそも, 元はといえば
e.g. I should have told you in the first place.