Fill in the blank with the correct option to form a meaningful sentence:-

The convincing but ______ argument of the lawyer led to the accused's acquital.

fallacious

The correct answer is Option (2) → fallacious

The sentence presents a contrast: the argument was convincing (it succeeded in freeing the accused) but had a negative quality that made it logically flawed.

• Fallacious (Adjective) means based on a mistaken belief, unsound, or misleading. This fits the context of a lawyer's argument that was persuasive but logically or ethically flawed.

• Fatal means causing death or ruin (too strong for a legal argument).

• Frail means weak and delicate (usually refers to people or objects, not arguments).

• Fair means just or equitable; this does not contrast with "convincing" and is generally positive.