In addition to the answers above it might help to reflect on the opposites of Hiri and Ottappa (Ahirika and Anottappa). Just as Hiri and Ottappa arise in all wholesome mental states, Ahirika and Anottappa arise in all unwholesome states of mind.
Ahirika (shamelessness / immodesty) has a characteristic of “no disgust over misconduct”, a function of “doing evil without shame”, a manifestation of “not shrinking away from evil” and a proximate cause of “lack of respect for self”. Just as a pig is not ashamed to roll in sewage, the mind is not disgusted with unwholesome actions, speech or thought. The Buddha said to his son, “Of anyone for whom there is no shame at intentional lying; of him I say that there is no evil he cannot do. ‘I will not speak a lie, even for fun’ – this is how you must train yourself”. In other words, there is no room for “white lies”. To check if there is Shamelessness in the mind, ask yourself, “Is this the kind of Mental State that could arise in an Arahat?” or ask yourself, “Would I be proud if my thought were reported as a headline in tomorrow’s newspaper?”
Anottappa (recklessness / lack of moral dread) has a characteristic of “no dread over misconduct”, a function of “doing evil without dread”, a manifestation of “not shrinking away from evil” and a proximate cause of “lack of respect for others”. Just as a moth gets attracted by fire and is burned, Recklessness is unaware of consequences, gets attracted by the unwholesome and plunges into the danger zone. To check if there is Recklessness in the mind, ask yourself, “Is this Mental State going to be the wind under my wings to lift me up, or the weight around my neck to drag me down?” or ask yourself, “What kind of kamma is this Mental State creating?”