Step 1: Understand the word "Wail."
"Wail" means to cry out loudly in grief or pain, usually expressing sorrow or distress. The synonym should reflect this meaning.
Step 2: Analyze the options.
- "Bear" means to carry or endure, which doesn't relate to crying out in distress.
- "Mourn" is the correct synonym, meaning to feel or show sorrow, often through crying or wailing.
- "Torture" refers to severe pain or suffering, but it doesn't mean to express grief through crying.
- "Reject" means to refuse or dismiss, which is unrelated to the meaning of "wail."
Step 3: Conclusion.
Thus, the correct synonym for "wail" is "mourn."
Final Answer: \[ \boxed{\text{Mourn is the correct answer.}} \]