The noun: the quality of saying things in few words and still saying them clearly. "The succinctness of her writing" means her writing has that quality, and saying so is praise. Though actually, this is a word to know rather than a word to use. It is clumsy in the mouth — three s-sounds and a hard cluster at the end — and most good writers avoid it. Where you might reach for it, English usually prefers *conciseness*, which is smoother, or simply rewrites the sentence around the adjective: not "I admire the succinctness of his emails" but "I admire how succinct his emails are". Both mean the same thing, and the second sounds better to a native ear. You will still meet it in writing about style, in editing guides, and in academic prose about language. Understanding it is what matters. When you need to produce this idea yourself, *brevity* is the common English word for shortness, *conciseness* for shortness done well — and *succinctness* is the one you can leave on the shelf.

言簡意賅、簡潔（作為一種特質）。這個字很拗口，實際上英文較常用 conciseness，或乾脆改寫成 how succinct...。