Where does “biterli” come from?

biterli (Middle English) comes from Old English biterlīċe, from Old English -līċe, from Old English -e, from Old English -en, from Old Norse -inn, from Proto-Norse -īna-, from Proto-Germanic -īnaz, from Proto-Indo-European -iHnos — adjectival suffix.

Ancestry of “biterli”, step by step

biterli traces back through two separate lines of ancestry.

via Old English biterlīċe

StepLanguageWordMeaning
1Old Englishbiterlīċebitterly
2Old English-līċely (adverbial suffix)
3Old English-eforming adverbs from adjectives; -ly
4Old English-enmæġþ + API → mæġden; cocc + API → cycen, cicen;...
5Old Norse-innUsed to create adjectives from nouns, meaning...
6Proto-Norse-īna-
7Proto-Germanic-īnaz-en
8Proto-Indo-European-iHnosCreates adjectives of materials
9Proto-Indo-European-no-adjectival suffix

via Old English bitterlīċe

StepLanguageWordMeaning
1Old Englishbitterlīċebitterly
Every word from Proto-Indo-European -no-Every word from Proto-Germanic -īnazEvery word from Old English -en