Definitions of awkwardness:

• noun:   trouble in carrying or managing caused by bulk or shape
• noun:   the inelegance of someone stiff and unrelaxed (as by embarrassment)
• noun:   the carriage of someone whose movements and posture are ungainly or inelegant
• noun:   the quality of an embarrassing situation

  Example: "He sensed the awkwardness of his proposal"

• noun:   unskillfulness resulting from a lack of training