IPA: /ˈfæs.ɪ.neɪ.tɪŋ.li/
KK: /ˈfæsnɪtɪŋli/
In a way that captures great interest or attention.
The documentary was fascinatingly detailed, keeping the audience engaged throughout.
Fascinatingly → It is formed from "fascinate" (from Latin "fascinare", meaning to enchant or bewitch) and the adverbial suffix "-ly" (meaning in a manner of). The word "fascinatingly" means in a manner that enchants or captivates.
Think of something that enchants or captivates you — that's what 'fascinatingly' means, describing how something can be truly enchanting.