Also, "lonely" is different from "alone". Being lonely is being alone and being unhappy about it. If you're alone but you're perfectly happy about it, you're

Also, "lonely" is different from "alone". Being lonely is being alone and being unhappy about it. If you're alone but you're perfectly happy about it, you're not lonely, you're just alone. Since the world is dominated by extraverts who feel lonely whenever they are alone, it is not surprising that these two terms are often used interchangeably. But to a raging introvert like Newton, they can have completely different meanings.