ultrahard

Adjective

Meaning

ultrahard (comparative more ultrahard, superlative most ultrahard)

Extremely hard; of utmost hardness.

ultrahard (not comparable)

harder than diamond, harder than 150GPa resistance

Source: en.wiktionary.org

Related terms

superhard

Close letter words and terms

ultragood ultragraph ultragreen ultraharmonic ultrahazardous ultrahazardous activity