"Foolishly fond" is a phrase used to describe someone who is overly attached or infatuated with something or someone in a way that appears irrational or illogical. There are numerous synonyms for this phrase, including "smitten," "besotted," "infatuated," "enamored," "captivated," "charmed," "entranced," and "enthralled." Each of these words conveys a similar idea of being overwhelmed by emotions and unable to think clearly or rationally about the object of one's affection. It is important to note that while these synonyms may have a negative connotation, being foolishly fond can also be a positive thing, indicating deep love, devotion, and passion.