The phrase "what-the-hell" is an expression of surprise, disbelief, or frustration. While it can be a strong phrase, there are alternative options that convey a similar sentiment in a more polite or professional manner. Some synonyms could include "what on earth," "good grief," "my goodness," "holy cow," or "seriously?" Each of these expressions share an element of shock or surprise, and can be used to convey the speaker's disbelief towards a certain situation or remark. While "what-the-hell" may seem like the most natural response in the moment, it is worth exploring these other phrases to broaden one's vocabulary and express oneself in a more nuanced way.