Not all instances of seeming anger may be what it seems but it is more muted and hard to detect. Emotional emptiness may be presented superficially as frustration, however, the emptiness may actually be exhaustion, lack of connection, or decrease in motivation. Whenever a person is emotionally exhausted, he or she reacts differently in subtle ways, which can be misinterpreted by other people. By being aware of these silent signals, individuals can be able to see what is actually occurring below the silence and act in a more conscious manner.
Quiet Distance

This is because he is likely to become quite silent, not because he is angry at that particular point in time, but because he no longer feels the urge to voice what is in his mind. The dialogues are briefer and less pronounced, and there is a stronger emotional retreat than a outburst of anger.
Low Energy

His presence can be strange and rather tiring and exhausting, instead of reactionary and high-pitched. Even ordinary everyday things appear to take some effort and that demonstrates that it is not frustration but a more profound emotional drain.
Flat Reactions

It is possible that situations that used to raise excitement, concern or curiosity will now have minimal response. This emotional disinterestedness is often an indicator of the individual being outsourced in the events occurring around him.
Avoiding Conflict

Anger usually drives a person to conflict, yet emptiness of emotions usually does the converse. He can even withdraw out of a dispute altogether, not because the situation has been solved but because he simply has no emotional strength to get involved.
Routine Living

Life starts appearing to be a sequence of automatic behavior instead of a conscious decision. He is adopted in duties and habits without zeal, which indicates that he is merely going through.
Limited Interest

Interests, ambitions, or things that used to be important will slowly become unimportant. Being a hollow person, one may begin to think that things that previously gave satisfaction to him/her can become remote and irrelevant.
Emotional Walls

He can maintain superficial conversations and not talk about thoughts and feelings. This emotional block usually arises when an individual is alienated or uncertain about the way to recoup what he or she is undergoing.
Silent Withdrawal

Instead of outright venting his frustrations, he gradually withdraws and drags himself out of the social and interaction circles. The silent withdrawal is not necessarily indignation but can very likely mean that he is not connected with his surroundings and his very feelings.