Where does “attentively” come from?

Attentively comes from Middle English attentifli, though its precise original meaning remains unattested in available sources.

attentively (English): In an attentive manner

Definitions

  1. In an attentive manner

Ancestry of “attentively”, step by step

attentively traces back through two separate lines of ancestry.

via English attentive

StepLanguageWordMeaning
1EnglishattentivePaying attention; noticing, watching, listening,...
2Middle Englishattentif
3Old Frenchattentif
4Latinattentusdetained, delayed; preserved, guarded; attentive,...
5LatinattineoI bring or hold to or near; I hold fast, keep,...
6Latinad-to; usually prefixed to verbs, in which cases it...
7Latinīn-un-, non-, not
8Latinînin, at, on, upon, from (space)
9Latinenlookǃ beholdǃ; reallyǃ?; come onǃ
10Proto-Italicenin
11Proto-Indo-Europeanh₁énin

via Middle English attentifly

StepLanguageWordMeaning
1Middle Englishattentifly
Every word from Proto-Indo-European h₁énEvery word from Latin īn-Every word from Latin ad-