Palm Reading: Flexibility of Thumb Signifies Easy-Going vs Stubborn Person
How flexible is the thumb? The flexibility of the thumb is thought to measure how adaptable a person is. The more flexible the thumb, the more easy-going the character is. A lack of flexibility suggests an obstinate person.
Does the thumb have a "waist"? If the thumb narrows in the base phalange of the thumb, the person is thought to employ tact and diplomacy in his or her relations with others.
Some consider the relative length of the thumb as an indicator of faithfulness. Longer thumbs are thought to indicate stronger characters who are faithful to others and to themselves.