"No turning back" is a phrase that often indicates a point of no return, a decision or action that cannot be undone. However, this expression can be substituted with several synonyms that also convey the same sense of finality. For instance, "irrevocable" denotes a decision that cannot be changed or reversed. Another alternative is "irreversible," which indicates that a situation has reached an unchangeable state. Similarly, "inexorable" refers to an outcome that cannot be avoided or altered, while "unalterable" indicates a situation or condition that cannot be modified or amended. All these synonyms share the same meaning with "no turning back" and may be used interchangeably depending on the context.