fitness - The condition of being physically healthy and strong, often as a result of exercise and proper nutrition
fixation - An obsessive interest in or feeling about someone or something.
firestorm - A violent outburst or uproar of emotion, controversy, or public reaction.
noun
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Other / Enticeflirt - A person who habitually flirts
noun
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Good / Energyflourish - A bold or extravagant gesture or action, made especially to attract the attention of others
flaky - Unreliable or inconsistent in behavior, especially in keeping commitments.
noun
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Good / Smartfinesse - Intricate and refined delicacy
noun
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Bad / Mistakeflop - A failure
flaccid - Lacking strength, firmness, or resilience.
noun
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Good / Flexibleflex - The action or state of flexing
noun
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Other / Fastfling - A short period of enjoyment or wild behavior
noun
See verb
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Other / Lightflicker - An unsteady movement of a flame or light that causes rapid variations in brightness