Where does “takknemligheit” come from?

takknemligheit (Norwegian Nynorsk) comes from Norwegian Nynorsk heit, from Proto-Germanic haitaz, from Proto-Indo-European *keHy- — to heat.

Ancestry of “takknemligheit”, step by step

takknemligheit traces back through two separate lines of ancestry.

via Norwegian Nynorsk heit

StepLanguageWordMeaning
1Norwegian Nynorskheit
2Proto-Germanichaitazhot
3Proto-Indo-European*keHy-to heat

via Norwegian Bokmål takknemlig

StepLanguageWordMeaning
1Norwegian Bokmåltakknemligthankful, grateful
2Old Norseþakknæmiligr—
3Middle Low Germandanknamelik—
Every word from Proto-Indo-European *keHy- →Every word from Proto-Germanic haitaz →Every word from Norwegian Nynorsk heit →