IPA: /ˈwaɪzər/
KK: /ˈwaɪzər/
Having more knowledge or experience than someone else; being more sensible or judicious.
With age, she became wiser and made better decisions.
Wiser → It is formed from "wise" (from Old English "wīs", meaning having knowledge or good judgment) and "-er" (meaning a person who). The word "wiser" means a person who has more knowledge or good judgment than another.
Think of someone who has more knowledge or good judgment — that's what 'wiser' means, as it describes a person who is more 'wise'.