Forethink is a verb that means to anticipate or think ahead. There are several synonyms for this word that can be used depending on the context. One synonym is to forecast, which implies that the one who is forethinking is making a prediction about something. Another synonym is to plan, which suggests that the individual is thinking about the future and making arrangements for it. Other possible synonyms include to premeditate, to preconceive, to envisage, and to foresee. All of these words suggest that the individual is thinking ahead of time, and are useful for describing actions that require long-term planning and preparation.