Comparative form of 'fond': having stronger feelings of affection, liking, or attachment toward someone or something.
From Old Norse 'fann' meaning to be fond, or possibly from an older root meaning 'to incline toward.' The '-er' creates the comparative form.
Psychologically, people often become fonder of things the less available they are—it's called the scarcity principle, which is why we remember people and things more fondly after they're gone.
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