aldeilis

Borrowed from Danish aldeles, partly from al- +‎ -deles, derived from del (compare Danish særdeles, Icelandic sérdeilis), and partly from Medieval Danish alleledis, derived from led (“way”) (compare Icelandic leið and svoleiðis), which became conflated with the former, perhaps by metathesis.

• IPA^(key): /ˈaltei(ː)lɪs/

aldeilis

1. (dated) completely, totally

   Synonyms: alveg, algjörlega, gjörsamlega

2. (chiefly in the negative) at all

   Synonym: alls

3. an intensifier used as a sentence adverb to indicate an abundance or great degree

   Synonym: heldur betur

   Þú varst aldeilis lengi!

   You took your time!

• Ásgeir Blöndal Magnússon (1989) “aldeilis”, in Íslensk orðsifjabók, Reykjavík: Árni Magnússon Institute for Icelandic Studies, →ISBN (Available at Málið.is under the “Eldri orðabækur” tab.)
• “aldeles” in Ordbog over det danske Sprog