Doubt is the feminine noun that indicates a state of uncertainty in relation to reality or hesitation between two things.
In some cases, doubt can be synonymous with suspicion and skepticism.
When a person has doubts about something, he usually looks for someone who can clarify the doubt. Ex: I was having questions about my income tax, so I called my accountant.
The expression "Just in case" is used when taking a precaution because you are not sure of something. Ex: Just in case, it's better to take another change of clothes, because I think it's going to rain.
There is also the adverbial phrase "no doubt", which means for sure or certainly and is an expression used to corroborate some statements or answer some questions.
doubt and doubt
Both doubt and doubt are existing words. While doubt is the noun, doubt (without the accent) is the conjugation of the verb to doubt, in the third person present tense. Ex: I have no doubt that my boss doubts my abilities, and that's why I won't be promoted.
Methodical and hyperbolic doubt
One of the characteristics of skeptical philosophy is definitive doubt, which later becomes an end. On the other hand, doubt is momentary when it occurs during a reflection activity or when it is used as a rational method of inquiry, known as methodical doubt.
Methodical doubt, created by René Descartes, consists of a critical attitude of doubting everything that is considered to be true. The Cartesian system uses doubt as a method, in which logical steps are taken in which doubt increases until reaching a point where everything is doubted. This doubt is exaggerated, and for this reason it is also known as hyperbolic doubt. In some cases, doubt ceases, and fundamental principles are learned for the one who initially doubted.