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shy
Don't be so shy - everything will be OK.
My sister is very shy, she never talks to strangers.
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timid
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fearful
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apprehensive
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fearsome
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milky
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spooky
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spineless
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weak-kneed
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faint-hearted
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fainthearted
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pigeon-hearted
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rabbit-hearted
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timorous
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pusillanimous
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trepid
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trepid
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trepidant
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willyard
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willyart
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chickenshit