旺盛
wàngshèng · HSK 7
vigorous
🔥 旺 = fire 火 + king 王 (a blazing reign); 盛 = abundant — both halves mean flourishing
旺盛 stacks two flourishing characters: 旺 carries the fire radical 火 beside 王 (king), suggesting a blazing, thriving force, and 盛 means abundant or full. Together they describe energy or growth that burns strong and plentiful.
旺 — sun 日 + flourish 王
Originally written 暀, meaning bright sunlight spreading outward. Over time the form simplified to 旺, combining 日 (sun) with 王 (king/flourish), which also hints at the pronunciation. The meaning shifted from 'bright' to 'flourishing, prosperous, vigorous.'
盛 — 成 (chéng, phonetic) + 皿 (vessel)
A phono-semantic compound: 皿 (a dish or vessel) gives the meaning, while 成 supplies the sound. The original sense was grain heaped into a ritual vessel as an offering, hence 'to fill' or 'contain' (chéng). From 'full to the brim' it extended to 'abundant, flourishing, prosperous' (shèng).