Underestimate Proverbs

Never underestimate the power of stupid people in large numbers. (Kiganda Proverb)
Don't underestimate the determination of a quiet person. View proverb
African Proverb
Never underestimate an enemy. View proverb
American Proverb
Never underestimate a quiet person, for he may have qualities that belie his quiet nature. View proverb
Indonesian Proverb