This root means "to bend" or "to curve", and it's found in a variety of words related to bending, curving, and adaptability:
* Flexible: Able to bend easily without breaking.
* Flex: To bend or curve.
* Reflex: An involuntary action or movement in response to a stimulus.
* Inflection: A change in pitch or tone of voice.
* Flexor: A muscle that bends a joint.
* Deflect: To turn aside or change direction.
It's important to note that the root "flex" is not always directly translated into "flexible" when it appears in English words. The meaning can change depending on the context and other parts of the word.