The noun forms of the adjective 'flexible' are flexibleness and flexibility.
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The adjective is flexible. A different noun form of flexible is flexibleness, which is seldom used.
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By adding the suffix -ness to the end of the adjective flexible the noun flexibleness is formed.
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The state or quality of being flexible; flexibleness; pliancy; pliability; as, the flexibility of strips of hemlock, hickory, whalebone or metal, or of rays of light.
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The state or quality of being flexible; flexibleness; pliancy; pliability; as, the flexibility of strips of hemlock, hickory, whalebone or metal, or of rays of light.