Rendered speechless is a phrase used to describe someone who is so shocked or surprised that they are unable to speak. This phrase can be expressed in three different ways: AGHAST (6 letters), STUPEFIED (9 letters), and AMAZED (6 letters). AGHAST is an adjective used to describe someone who is filled with horror or shock. STUPEFIED is an adjective used to describe someone who is so overwhelmed that they are unable to think or act. Lastly, AMAZED is an adjective used to describe someone who is filled with wonder or astonishment. All three words can be used to describe someone who is rendered speechless.