Introduction:
When a child is separated from his parents, his insecurity can be described as a feeling of fear, anxiety, and vulnerability. This separation can occur in various situations such as during a family trip, at a crowded place, or due to other unforeseen circumstances. The child's sense of security is deeply shaken as he is suddenly disconnected from the source of his emotional support and protection.

Short Answer:
The child's insecurity can be seen in his behavior and emotions, such as crying, clinging to strangers, or feeling lost and disoriented. He may experience a sense of abandonment and loneliness, which can lead to increased anxiety and fear. The child may also display signs of distress, such as restlessness, withdrawal, or difficulty in focusing on other activities.

Long Answer:
1. Emotional Distress:
When a child is separated from his parents, he may initially experience shock and disbelief. This can quickly turn into emotional distress, as the child realizes that he is alone and unable to find his parents. This distress is often expressed through crying, screaming, or calling out for his parents. The child may also exhibit signs of panic and fear, as he feels vulnerable and unsafe without the presence of his parents.

2. Feeling Lost and Disoriented:
The child's insecurity is further evident in his disoriented behavior. He may wander aimlessly, unable to find his way back to his parents or familiar surroundings. This disorientation can intensify the child's anxiety and contribute to a deep sense of insecurity.

3. Clinging to Strangers:
In an attempt to find security and reassurance, the child may cling to strangers or other familiar figures. This behavior stems from the child's innate need for connection and protection. However, it also reflects his desperate attempt to fill the void left by his parents' absence.

4. Abandonment and Loneliness:
Separation from parents can trigger feelings of abandonment and loneliness in the child. He may experience a profound sense of loss, fearing that his parents have permanently left him. This emotional turmoil can further amplify his insecurity and heighten his distress.

5. Increased Anxiety and Fear:
The child's insecurity is often accompanied by heightened levels of anxiety and fear. He may become hypervigilant, constantly scanning the environment for any signs of his parents. This anxiety can also manifest as nightmares, sleep disturbances, and a general sense of unease.

In conclusion, when a child is separated from his parents, his insecurity is characterized by emotional distress, disorientation, clinging to strangers, feelings of abandonment and loneliness, as well as increased anxiety and fear. It is crucial to provide immediate support, comfort, and reassurance to help the child regain a sense of security and stability.