This page has material from the Super Amigos franchise. This includes any Superfriends or Super Powers material in the Spanish or Portuguese language. Although some material may be canon, others may be subject to dispute.
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This doesn't mean that the person who felt such an emotion had to actually be alone, but it does mean that they at least must experience the feeling of being alone.
Sometimes a person might have had many acquaintances and even a lover; but if it was felt that there was little understanding between them, this often times led to them feeling lonely.