そもそも

in the first place; to begin with; from the start; originally; ab initio

N4Common wordAdverb
Adverb, Noun
in the first placeto begin withfrom the startoriginallyab initio
Conjunction
after allanywayactuallywell, ...... on earth (e.g. "what on earth?")... in the world (e.g. "why in the world?")
Noun, No-adjective
beginningstart