12 letters · 19 points in Scrabble
adverb with extreme conscientiousness
originFrom scrupulous + -ly, from Middle French scrupuleux, from Latin scrūpulōsus (“careful, scrupulous”), from scrūpulus (“anxiety, uneasiness”), diminutive from scrūpus (“sharp stone; anxiety”) + -ulus.
Etymology from Wiktionary, CC BY-SA 3.0