(のうが)

のうがき
noun
boasting; bragging; self-promotional claims
informalcommunication
1. boasting; bragging; self-promotional claims; sales pitch
Self-promoting talk or written claims about how good something is. Originally referred to the description of a medicine's efficacy on its packaging, and by extension came to mean exaggerated claims or boasting in general. Often used dismissively.
能書(のうが)いいから(はや)やれ
Enough talk — just get on with it.
Nobody will trust you if all you do is boast.
Even if you read the product claims, you can't tell if it actually works.

Originally referred to the printed description of a medicine's ingredients and efficacy (能書(のうが)き = list of capabilities/effects). Over time, the meaning shifted to 'self-promotional talk' or 'boasting,' with a dismissive or skeptical nuance. Almost always used negatively.

Common collocations

Usage

The phrase 能書(のうが)いいから is a common way to tell someone to stop talking and start doing. The word carries an inherently skeptical tone — the speaker implies the claims are exaggerated or empty.

Etymology

From 能書(のうしょ) (a document listing the properties and efficacy of medicine) + き (a suffix). The original neutral meaning of 'product description' has largely given way to the negative sense of 'empty boasting.'