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Intensity (4 letter answer)
The answer ZEAL is seen frequently, appearing about once every 180 puzzles.
Antithesis of apathy
ZEAL as a noun:
1. (ardor, ardour, elan, zeal) = a feeling of strong eagerness (usually in favor of a person or cause); "they were imbued with a revolutionary ardor"; "he felt a kind of religious zeal"
2. excessive fervor to do something or accomplish some end; "he had an absolute zeal for litigation"
3. (readiness, eagerness, zeal, forwardness) = prompt willingness; "readiness to continue discussions"; "they showed no eagerness to spread the gospel"; "they disliked his zeal in demonstrating his superiority"; "he tried to explain his forwardness in battle"