What behavior can be characterized by a lack of self-respect and humility?

The behavior characterized by a lack of self-respect and humility is best described by the term "grovel." Groveling typically involves being excessively submissive or obedient, often to the point of demeaning oneself in front of others. This behavior reflects a deep sense of inferiority or a desire to appease, indicating that an individual is willing to forgo their self-respect. In situations where someone is groveling, they might debase themselves in order to seek approval or forgiveness, which starkly illustrates a lack of self-worth and humility.

The other terms do not capture this specific behavior. "Heed" suggests paying attention or being cautious, which does not imply a lack of self-respect. "Gullible" refers to someone who is easily deceived or tricked, not directly associated with humility or self-respect. "Guile" involves cunning or deceitful behavior, which is more about manipulation than self-perception. Thus, groveling is the behavior that most accurately embodies a lack of self-respect and humility.