Answer:
Rigid
Step-by-step explanation:
Rigidity is the condition of being inflexible, unyielding, or unable to easily adapt to a situation/condition. The statement above, exemplifies rigidity for the speaker feels unease when he is to speak to groups. Therefore, he dislikes giving reports.
A person who is not rigid will find a way to adjust or improve in his speaking abilities. Flexibility makes people adaptable to different situations.