the word 'thrilling' originates from the old english verb þyrlian, meaning "to pierce or penetrate," which is itself derived from the noun þyrel, meaning "a hole." this literal sense of piercing evolved metaphorically in middle english to describe a sharp, piercing sensation or emotion, such as a sudden wave of excitement or fear that seems to "pierce" one's composure. the addition of the present participle suffix '-ing' transforms the verb into an adjective, describing something that causes such a penetrating, intense feeling. thus, the modern meaning of 'thrilling'—causing a sudden, sharp feeling of excitement—retains the core metaphorical logic of its ancient root, moving from physical piercing to emotional stimulation.

Structure: thrill (to pierce, to cause a sharp feeling) + ing (adjective-forming suffix) thrill (from old english þyrlian "to pierce, perforate", related to þyrel "hole") + ing (from old english -ende, present participle ending, used to form adjectives from verbs)