In Chinese culture, mountains (山, shān) are not just geographical features; they are sacred places, sources of artistic inspiration, and symbols of stability, power, and permanence. The Five Great Mountains (五岳, Wǔyuè) have been revered for centuries. The word 巍峨 taps directly into this deep cultural respect. When you describe a mountain as 巍峨, you are doing more than just stating its height. You are invoking a sense of reverence, history, and natural power. It's a word used by poets, artists, and emperors to convey the sublime. A Western comparison could be the difference between “tall” and “sublime.” A skyscraper is “tall,” but the Grand Canyon is “sublime.” The word “sublime” carries an emotional and almost spiritual weight, capturing a feeling of awe in the face of nature's grandeur. 巍峨 functions similarly in Chinese, applying that feeling primarily to mountains and monumental human creations that rival them.
Due to its literary and formal nature, 巍峨 is not a word you'll hear in everyday, casual conversation.
You would not use 巍峨 to describe a tall person, a regular tree, or a standard apartment building. For that, you would use 高 (gāo) or 高大 (gāodà).
The most common mistake for learners is using 巍峨 in contexts that are not grand enough. It has a very specific, high-level connotation.