From an unused root meaning to sting; a thistle -- brier.
H5621. sarab
[סָרָב] noun masculine rebel ? according to Thes and others (probably Aramaic loan-word, compare Aramaic contradict, chatter, prattle, tell lies; Pa`el סְרַב and Late Hebrew Pi`el סֵרֵב = Biblical Hebrew; compare סרב Ecclus 41:2d loving contradiction); — plural absolute (i.e. אִתָּךְ) אוֺתָ֑ךְ וְסַלּוֺנִים סָרָבִים Ezekiel 2:6 rebelles et quasi spinae sunt erga te Thes; Vrss read participle, Co Berthol וְסֹלִים סֹרְבִים resisting and despising thee (compare סַלּוֺן); AV RV briers and thorns compare Ew Hi-Sm SiegfKau Da Toy.