acuminate

Acuminate is a nine-letter word with no doubled letter in it, which is the single hardest thing about writing it down. Five of the seven spellings filed here double something.

Drawn out into a long, narrow, tapering point. It describes the tip rather than the whole blade, and the extreme version is the drip tip of a rainforest leaf, which sheds water off the end.

The root is Latin acumen, a point or a sharpened tip, which English also borrowed whole for mental sharpness. Acuminate is what happens when acumen takes the -atus ending. Only one syllable in the word is stressed, the KYOO, and the four unstressed ones around it are where the writing goes.