p 3 e 1 r 1 t 1 i 1 n 1 a 1 c 3 i 1 o 1 u 1 s 1 n 1 e 1 s 1 s 1
16 letters · 20 points in Scrabble
Meaning
originEtymology tree English pertinacious Proto-Germanic *-inōną Proto-Indo-European *-dyé- Proto-Germanic *-atjaną Proto-Indo-European *-tus Proto-Germanic *-þuz Proto-Germanic *-assuz Proto-Germanic *-inassuz Proto-West Germanic *-nassī Old English -nes Middle English -nesse English -ness English pertinaciousness From pertinacious + -ness.
Etymology from Wiktionary, CC BY-SA 3.0