IPA: /ʌnˈwɪzdəm/
KK: /ʌnˈwɪzdəm/
The state of not having good judgment or making poor decisions.
His unwisdom led him to invest in a failing business.
Unwisdom → It is formed from "un-" (meaning not) and "wisdom" (from Old English "wisdom", meaning knowledge or insight). The word "unwisdom" means the state of not having wisdom or lacking good judgment.
Think of 'not' ('un-') having 'knowledge' ('wisdom') — that's why unwisdom means lacking wisdom.