Instruction: Select the option that is most nearly opposite to the given word.

Foolishly means acting without good sense or judgment, while wisely means acting with good judgment and prudence. Though shrewdly, cannily, and astutely all convey intelligence and careful thinking, 'wisely' is the most direct and common antonym in vocabulary tests, emphasizing sound judgment as the core opposite of foolish behavior.

Step-by-step Derivation:
Analyze each option as an antonym for 'foolishly': (A) Shrewdly = acting with keen judgment and self-interest; (B) Cannily = acting with careful shrewd judgment; (D) Astutely = acting with keen insight and discernment. All three convey intelligence, but 'wisely' (C) directly opposes 'foolishly' by emphasizing prudent, sound judgment as the foundational opposite. In standardized vocabulary tests, 'wisely' is the classical antonym for 'foolishly.'