strength the property of being physically or mentally strong; "fatigue sapped his strength"
firmness -
the property of being unyielding to the touch
hardness the quality of being difficult to do; "he assigned a series of problems of increasing hardness"; "the ruggedness of his exams caused half the class to fail"
firmness -
the trait of being resolute; "his resoluteness carried him through the battle"; "it was his unshakeable resolution to finish the work"
decisiveness,
decision the trait of resoluteness as evidenced by firmness of character or purpose; "a man of unusual decisiveness"
purpose,
determination an anticipated outcome that is intended or that guides your planned actions; "his intent was to provide a new translation"; "good intentions are not enough"; "it was created with the conscious aim of answering immediate needs"; "he made no secret of his designs"
firmness -
the quality of being steady or securely and immovably fixed in place