dishearten

verb

to cause (someone) to lose confidence

Wiktionary

Pronunciation: /dɪsˈhɑː.tən/ / /dɪsˈhɑɹ.tən/

verb

Etymology: Etymology tree Proto-Indo-European *dwóh₁ Proto-Indo-European *d(w)is- Proto-Italic *dis- Latin dis- Old French des-bor. ▲ Latin dis-bor. Middle English dis- English dis- Proto-Indo-European *ḱerd- Proto-Indo-European *ḱérd Proto-Germanic *hertô Proto-West Germanic *hertā Old English heorte Middle English herte English heart English -en English hearten English dishearten From dis- + hearten.

To discourage someone by removing their enthusiasm or courage.
“The repeated failures began to dishearten the team.”
“Do not let criticism dishearten you.”