At a glance
～というものだ states the speaker's firm judgment that something is, by common sense or by its nature, simply X: "that is (just) X" or "that's what X is". It is often used with words like 当然, 無理 and 失礼.
[Situation] のは / なんて + [noun / な-adj] + というものだ
努力しないで成功したいなんて、無理というものだ。 Wanting to succeed without making an effort is simply unrealistic.
How to form it
The situation is usually marked by のは, なんて or のが. The judgment word comes right before というものだ.
| Attaches to | Example | Register |
|---|---|---|
| な-adj stem | 無理というものだ | Neutral, a little formal |
| Noun | 常識というものだ | Neutral, a little formal |
| Polite ending | 当然というものです | Polite |
| Casual spoken ending | 無理ってもんだ / 無理というもんだ | Casual |
Nouns and な-adjective stems are the most common before というものだ.