How to Say "plausible" in Spanish
The Spanish word for “plausible” is “probable” — B1 level. This is a very common word in everyday Spanish.

Examples
Es probable que llueva esta tarde, mejor lleva paraguas.
It is probable that it will rain this afternoon, better take an umbrella.
La causa más probable del accidente fue la velocidad excesiva.
The most probable cause of the accident was excessive speed.
Los resultados probables de la elección se conocerán mañana.
The likely results of the election will be known tomorrow.
Use with Subjunctive
When you use the impersonal phrase 'Es probable que...' (It is likely that...), the next verb must be in the special 'subjunctive' form: 'Es probable que venga' (It is likely that he/she comes).
Gender Agreement
This adjective is one of the handy ones that is the same for both masculine and feminine nouns. It only changes when the noun is plural: 'el resultado probable' and 'la causa probable' become 'los resultados probables'.
Forgetting Subjunctive
Mistake: “Es probable que *viene* mañana.”
Correction: Es probable que *venga* mañana. (The likelihood introduces uncertainty, requiring the special verb form.)
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