迅猛 (xùn měng) — rapid and fierce; swift and violent

Definition

迅猛 pairs swiftness with force — describes something that develops or strikes both rapidly and fiercely (e.g. 发展, 竞争, 进攻). 迅速 is just 'fast' with no intensity; 猛烈/凶猛 are fierce but not necessarily fast.

adjective

rapid and fierceswift and violent

Examples

迅猛，。
Kē jì fā zhǎn shí fēn xùn měng, xīn chǎn pǐn bú duàn chū xiàn.
Technology is developing rapidly and fiercely, with new products constantly appearing.
迅猛，。
Tā fǎn yìng xùn měng, lì kè duǒ kāi le wēi xiǎn.
He reacted swiftly and violently, immediately dodging the danger.
迅猛，。
Shì chǎng jìng zhēng yuè lái yuè xùn měng, qǐ yè bì xū bú duàn chuàng xīn.
Market competition is becoming increasingly fierce and rapid; companies must keep innovating.