This meaning refers to a feeling of uncertainty or lack of conviction about something. It can be used in contexts where one is unsure if something is true or valid.

This meaning refers to a lack of trust or confidence in someone or something. It can be applied to interpersonal relationships or evaluations of reliability.

This meaning involves a feeling or belief that something is likely to be wrong or not as it seems. It often implies a more active feeling of wariness or concern about someone's intentions.