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not
Negative adverb used before verbs, adjectives, and other adverbs to indicate negation; also used as a bound-form prefix to form terms with opposite meanings
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to worry
(bound form) to worry; to be anxious about something
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poor
(bound form) poor; impoverished; lacking wealth
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but
Used to connect ideas that contrast or conflict; yet; but; on the other hand
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to worry
(bound form) to worry; to be anxious about something
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unstable
Turbulent or unpeaceful, as in a social or political environment; restless