Definition: having no confidence in yourself and what you can do Level: C1
许多青少年对自己的外表感到不自信。
Many teenagers feel ___insecure about their appearance.
人们感到不自信和紧张，士气下降了。
People felt ___insecure and nervous, their morale went down.
她不自信的性格常常阻止她接受新挑战。
Her ___insecure nature often prevents her from taking on new challenges.
