The subjunctive mood is a grammatical form used to express hypothetical, doubtful or uncertain actions, thoughts, or states. However, depending on the language and the context, there are multiple synonyms for subjunctive mood. For example, in medieval Latin, it's known as the conjunctive mood, while many Slavic languages refer to it as the conditional mood. In Spanish, it's subjuntivo, while in French, it's known as the subjonctif. The subjunctive mood is also referred to as the irrealis mood in some linguistic settings. Regardless of what it is called, the subjunctive mood remains a vital grammatical tool used to express nuances of mood, possibility, or uncertainty in language.