Let us talk about the meaning and Latin origin of the
words---"Intrepid", "Trepidation" and
"Scintillation".
"Intrepid" derives from the Latin word trepido, to tremble. Intrepid people are audacious, exhibiting fearlessness, when confronted by dangers from which common mortals like us would run away.
"Intrepidity"
is the noun.
David's intrepidity exacts admiration from all his friends
and foes as well.
"Trepidation"
means trembling, great fear or alarm.
When we saw a mighty lion in the forest at some distance,we
fled from the spot in trepidation.
"Scintilla",
in Latin, is a quick, bright spark; in English scintilla may also mean a spark,
but more commonly refers to a very small particle.
There wasn't a scintilla of evidence to nail down the
notorious criminal.
In the verb scintillate, the idea of the spark remains;
someone who scintillates sparkles with charm and wit flashes brightly with
humor.