Opposite of casualness, facileness, or shallowness

Hesitation

Opposite of the claim or pretense of holding beliefs, feelings, standards, qualities, opinions, or virtues that one does not actually possess

Opposite of excessive talkativeness, especially on trivial matters

Opposite of having charm, sophistication or guile, especially when used to persuade others

Opposite of the ability to express oneself easily and articulately

Opposite of the state of being chatty

Opposite of the condition or quality of being phony or fake