To sign the word "adhibit," use your dominant hand to make a "A" handshape and bring it towards your mouth, then open and close your fingers as if taking something…
To sign the word "adhesives," use both hands to make the ASL letter A handshape and place them on either side of your head, moving them forward and slightly away…
To sign the word "adhesiveness," form the ASL letter A with your dominant hand and touch it to your non-dominant palm, then move your dominant hand away from your palm…