简洁 (jiǎn jié) is an adjective meaning 'concise' or 'succinct'—describing language, writing, design, or behavior that expresses ideas clearly and efficiently, without unnecessary words or ornamentation. The character 简 (jiǎn) means 'simple' or 'uncomplicated', while 洁 (jié) literally means 'clean' or 'pure'; together, they evoke the idea of clarity achieved through simplicity and absence of clutter.

This word is commonly used in formal and semi-formal contexts: evaluating speeches, editing essays, describing minimalist aesthetics, or praising clear instructions. It carries a positive, appreciative connotation—suggesting intelligence, discipline, and respect for the listener’s or reader’s time. Unlike colloquial terms like 简单 (jiǎn dān, 'simple'), 简洁 specifically emphasizes *economy of expression*, not just ease or lack of complexity.