Stroke Order
HSK 4 Radical: 辶 10 strokes
Meaning: fast
词组 · Compounds

📚 Character Story & Explanation

速 (sù)

The earliest form of 速 appears in bronze inscriptions around 1000 BCE as a composite pictograph: on the left, a simplified foot (止, later evolving into 辶 — the 'walking' radical), and on the right, a stylized depiction of a bird in flight (originally 隹, zhuī, meaning 'short-tailed bird'). This wasn’t random — ancient scribes associated birds’ swift, decisive movement with urgency and swiftness. Over centuries, the bird component transformed: 隹 lost its tail feathers and merged into 束 (shù), a phonetic hint (both 束 and 速 share the 'sù' sound), while the foot radical shifted below and right to become the familiar 'walking' enclosure 辶 — visually echoing motion toward a goal.

This evolution mirrors its semantic journey: from concrete avian speed in oracle bone script, 速 gained abstract force in classical texts — Mencius used it to describe the rapid moral awakening of the virtuous mind, and the *Zuo Zhuan* employed it in military dispatches ('速战!', 'Engage battle swiftly!'). The fusion of motion (辶) and phonetic clarity (束) created a character that’s both elegant and urgent — a visual haiku of haste. Even today, when you write those 10 strokes, you’re tracing the path of a bird cutting through wind — and centuries of human impatience, ambition, and precision.

Think of 速 (sù) as the Chinese equivalent of the red 'FAST' button on a microwave — it doesn’t just mean ‘fast’; it carries urgency, efficiency, and often an implied *intentional acceleration*. Unlike English adjectives like 'quick' or 'rapid', 速 functions powerfully as both an adjective ('fast speed') and a noun ('speed', 'rate'), especially in compound words — much like how 'speed' works in English phrases like 'speed dial' or 'speed reading'. But here’s the twist: in Chinese, you almost never say '很速' (hěn sù) to mean 'very fast' — that’s a classic learner mistake! Instead, use 快 (kuài) for everyday 'fast', and reserve 速 for technical, formal, or compound contexts: 速度 (sùdù, 'speed'), 加速 (jiāsù, 'to accelerate'), or 速食 (sùshí, 'instant food').

Grammatically, 速 shines in verb-object constructions and as a prefix. You’ll see it in imperative-like expressions like 速回 (sù huí, 'reply immediately!') — common in work emails or WeChat group notices — where it packs the punch of 'ASAP' without sounding rude. It also appears in fixed idioms like 不速之客 (bù sù zhī kè), literally 'a guest who did not speed-arrive', meaning 'an uninvited guest' — a beautiful, slightly archaic phrase still used in literature and formal speech.

Culturally, 速 reflects China’s modern embrace of efficiency — from high-speed rail (高铁, gāotiě) to express delivery (快递, kuàidì). Yet paradoxically, classical texts used 速 with caution: Confucius warned against '欲速则不达' (yù sù zé bù dá) — 'hastening leads to failure' — reminding learners that while 速 is practical, its moral weight includes wisdom about timing. Don’t rush your understanding of this character; let its layers unfold.

💬 Example Sentences

Common Compounds

💡 Memory Tip

Imagine a SPEEDY bird (sound 'sù') zooming along a sidewalk (radical 辶 = walking path) — and it's carrying a bundle (束 = 'bundled up' for speed!) so it won't slow down!

Similar Characters — Don't Mix These Up

Related words

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