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All answers having "Thoughtful" as clue:

3 Character Answers:

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ASS



4 Character Answers:

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DEEP

NICE

SANE



5 Character Answers:

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AGAIN

GRAVE

SOBER



6 Character Answers:

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CARING

DECREE



7 Character Answers:

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MONITOR

PENSIVE

SERIOUS



10 Character Answers:

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COGITATIVE

MEDITATIVE

REFLECTIVE



11 Character Answers:

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CONSIDERATE



13 Character Answers:

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CONTEMPLATIVE