Definition of insecure. 1  1 : not confident or sure : uncertain feeling somewhat insecure of his reception. 2  2 : not adequately guarded or sustained : unsafe an insecure investment. 3  3 : not firmly fastened or fixed : shaky the hinge is loose and insecure.
For men, semi-formal attire means wearing a full suit, with vest optional. A tie, either bow or straight, should be worn, and the shirt should be a simple button down. Suit fabric choices are primarily wool gabardine or cashmere. However, a wool blend will do.
Related Articles. Semi-formal dress is less formal than black-tie dress but more formal than cocktail attire. A semi-formal dress code is expected for moderately formal events, such as weddings, award ceremonies, bar and bat mitzvahs and a night at the theater.