Negation Intensity (Not At All)
3 related grammar points that express the same core idea - compared below so you can tell which one to reach for.
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すこしも〜ない / 決して〜ない
Making a commitment or a categorical denial.
決して～ない vs すこしも〜ない: Use 決して〜ない. It is a declaration about all occasions ('never, under any circumstances') and belongs to writing and formal speech. すこしも〜ない measures a quantity down to zero ('not in the slightest') and cannot promise anything about the future.