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All answers having "Apprehensive" as clue:

3 Character Answers:

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RHO



4 Character Answers:

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EDGY



5 Character Answers:

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ANTSY

LEERY

SLEET

TENSE

TIMID



6 Character Answers:

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AFEARD

AFRAID

NEBULA

ONEDGE

SCARED

TREPID

UNEASY



7 Character Answers:

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AFEARED

ALARMED

NERVOUS

WORRIED