eye-wateringly

adverb1

1. •
   In a manner or to a degree that causes one’s eyes to water or tear up, often due to an emotional situation or sentimental feelings, or due to shocking or exciting events.

   • Another Indonesian soup, asam shrimp […], includes incredibly fresh shrimp in their shells and okra in a tamarind broth that is wonderfully tart and sweet and eye-wateringly spicy. — 1994