instantly

The story

1. Proto-Indo-European*énu
2. Latinin-
3. Proto-Indo-European*steh₂-
4. Proto-Indo-European*sth₂éh₁yeti
5. Proto-Italic*staējō
6. Proto-Italic*staēō
7. Latinstō
8. Latinīnstō
9. Latinīnstāns
10. Old Frenchinstant
11. Middle Englishinstant
12. Latinīnstān
13. Frenchinstant
14. Englishinstant
15. Proto-Indo-European*leyg-
16. Proto-Germanic*līką
17. English todayinstantly

From instant + -ly.

First known use, by meaning

• from 16th c. At once; without delay.
• from 15th c. Urgently; with insistence.