The antonym for "Mighty" is "Weak." Here's an explanation:

• Mighty: This word refers to something or someone possessing great power, strength, or force.

• Weak: The antonym of "Mighty," it refers to lacking in strength, vigor, or power.

So, in this context, "Weak" is the opposite of "Mighty" because it denotes a lack of strength or power.

• Strong and tough: These words are related to "mighty" in terms of power or force, but they are not its opposites. They denote different aspects of strength, such as physical power ("strong") or resilience ("tough").
• Haughty: This word describes someone who is arrogant or proud, which is not necessarily the opposite of being mighty. A mighty person can be humble despite their power.