More about scintillating
Scintillating “witty, brilliantly clever” ultimately derives from the Latin noun scintilla “glittering speck, spark.” Scintilla and its few derivatives refer generally only to physical phenomena; the only metaphorical sense that scintilla has is of eyes flashing in anger or passion, not the sense of sparkling or flashing wit. Scintilla comes from the Proto-Indo-European root skai– (and its variants) “to glow dully, reflect,” as in Greek skiā́ “shadow,” Gothic skeinan “to light, shine,” and Old English scīnan (English shine). Finally, Tocharian B skiyo “shadow, shade,” is exactly equivalent to Greek skiā́. Scintillating entered English in the second half of the 17th century in its literal sense; the sense “witty, clever” dates from the end of the 18th century.