also: いきよい
The force of the fire suddenly grew stronger.
Her speech had energy.
Used for the power or influence held by a person, family, regime, organization, or other force; somewhat common in historical or political descriptions.
At that time, the Taira clan's power was extremely strong.
Covers the forward drive of events or feelings, including doing something on impulse in the phrase 勢いで and riding momentum in 勢いに乗る.
The team rode the momentum of its winning streak all the way to the final.
I got carried away in the moment and bought an expensive watch.
inevitably; naturally; necessarily
Adverbial use meaning that something follows naturally or inevitably from the circumstances; it is more written or formal than everyday expressions such as どうしても or 結局.
If the discussion drags on, the conclusion will inevitably be postponed.
His way of speaking has real energy.
The team rode its momentum to a winning streak.
If the declining birthrate continues, a labor shortage will inevitably follow.
I quit my job on impulse.
The typhoon's intensity is weakening.
Let's build up momentum and try again.
Attested spelling with irregular okurigana; much less common than 勢い and best treated as a reading/search variant.