swifts is a form of:

Adamantine



adjective
1.
ដែលធ្វើពីថ្ម, ដែលរឹងដូចពឹជ្រ, ដែលមិនប្រែប្រួល
ENGLISH MEANING
adjective
1.
Made of adamant, or having the qualities of adamant; incapable of being broken, dissolved, or penetrated; as, adamantine bonds or chains.
2.
Like the diamond in hardness or luster.