What is the synonym for startling? What is the synonym for toothless?
What is the synonym for gave up?

Startling : stunning, staggering, astonishing

Toothless: agomphious, edentate, edentulous, futile, ineffectual, weak, sulky, feeble and toothed.

Gave up: quit, surrender, renounce, lose courage, abandon, cease, lose-heart, cede, hand over, yield and abjure.

Explanation:

glamis thou art, and cawdor; and shalt be what thou art promis'd; yet do i fear thy nature; it is too full o' the milk of human kindness to catch the nearest way: thou wouldst be great; art not without ambition; but without the illness should attend it. what thou wouldst highly, that wouldst thou holily; wouldst not play false, and yet wouldst wrongly win: thou'dst have, great glamis, that which cries, "thus thou must do, if thou have it: and that which rather thou dost fear to do than wishest should be undone." hie thee hither, that i may pour my spirits in thine ear; and chastise with the valor of my tongue all that impedes thee from the golden round, which fate and metaphysical aid doth seem to have thee crown'd withal.  

he lacks ambition.  

he is hesitant.  

he lacks courage.  

he has moral scruples.

explanation:

it refers to the definition of full-contact sports, where the condition is that the sport must have athletes must "purposely collide with each other