sadness, sorrow
The article is part of the word: la tristeza. That way you learn the gender with it.
On the card “sadness”, ripiti also accepts la pena. Not the other way round: for la pena, la tristeza is not accepted.
Remember la tristeza for good. ripiti brings the word back just before you forget it, with these sentences. Free, no account needed, works offline.
practise la tristeza in ripiti