reserve
The Italian word 'riserva' is used to describe a reserve or a backup supply. It can also refer to a reserve of a particular group or category, such as a reserve of troops or a reserve of funds. In the context of wine, 'riserva' is used to indicate a wine that has been aged for a longer period of time than usual, resulting in a more complex and refined flavor.
I have reservations about his sincerity.
In this context, 'riserva' is used in its singular form to express doubts or uncertainties about something, in this case, someone's sincerity.
The water reserve is almost empty.
Here, 'riserva' refers to a stockpile or a storage, specifically of water, implying that the supply is almost depleted.
I can't drink wine, I am on reserve.
In this sentence, 'riserva' implies a state of self-restraint, where the speaker is preserving themselves or refraining from drinking wine in this case.