to not deserve such praise or honor; a polite formula used in response to a compliment

to beg to differ (idiom)

A polite expression used to indicate that one does not deserve the honor or praise being bestowed.

To be angry or indignant but not dare to express it openly, usually out of fear or constraint.

dare not go one step beyond the prescribed limit

not daring to act on one's own authority (idiom)

to be underwhelmed or find something disappointing or of poor quality

a polite formulaic expression used to decline an invitation, connection, or favor by suggesting one is not deserving