勢(いきお)いよく

The adverbial form of 勢(いきお)いがよい (having momentum/force). 勢(いきお)い is a noun meaning "momentum, force, vigor," and よく is the adverbial form of よい (good). Together they describe an action performed with noticeable force or energy.

Common collocations

• 勢(いきお)いよく飛(と)び出(だ)す — to jump out energetically
• 勢(いきお)いよく流(なが)れる — to flow strongly
• 勢(いきお)いよく食(た)べる — to eat with gusto
• 勢(いきお)いよく成長(せいちょう)する — to grow vigorously

Similar words

• 激(はげ)しく — violently, intensely (stronger; implies more extreme force)
• 力強(ちからづよ)く — powerfully, strongly (focuses on strength)
• 元気(げんき)よく — cheerfully, energetically (focuses on liveliness rather than physical force)
• 一気(いっき)に — all at once (focuses on speed and continuity rather than force)