IPA: /ˈstʌltɪfaɪ/
KK: /ˈstʌltəˌfaɪ/
To make someone or something seem foolish or ineffective, often by proving them wrong or showing their mistakes.
The constant criticism from his peers began to stultify his confidence and creativity.
Past: stultified
Past Participle: stultified
Stultify is formed from "stultus" (meaning foolish) and the suffix "-fy" (meaning to make). The word means to make someone or something foolish or to cause a loss of intelligence or effectiveness.
Think of making something 'foolish' ('stultus') — that's why stultify means to make someone or something foolish.