To sign the word "adamantness," use the American Sign Language (ASL) sign for "strong" or "firm" and add the suffix "-ness" by flicking the dominant hand's fingers upward towards the…
To sign the word "adamantine," use the ASL sign for "diamond" by making a fist with your dominant hand and placing it on your non-dominant palm. Then, move your dominant…
"To sign the word adamantean, use a combination of handshapes representing each letter and follow the spelling of the word while using facial expressions to convey the meaning."
To sign the word adamant, you would use a handshape with the index and middle finger extended and slightly bent, touching your chin and then your chest.