adamant /adˈə-mənt or -mant/

1. A name applied by the ancients to various hard substances, eg steel
2. An imaginary rock with fabulous properties
3. Diamond (obsolete)
4. Lodestone (obsolete)

Unyielding

adamantēˈan adjective (Milton)

Hard as adamant

adamanˈtine adjective

1. Unbreakable
2. Impregnable
3. Impenetrable
4. Magnetically attractive (obsolete)

adˈamantly adverb

adamantine lustre noun (mineralogy)

A lustre similar to the metallic but without opacity

• knowablenesses
• know a hawk from a handsaw
• know-all
• know-alls
• know all the answers
• know a man by his company
• know a move or two
• know a thing or two
• know better
• know by sight
• knowe
• knower
• knowers
• knowes
• know-how
• knowhow
• know how many beans make five
• know-hows
• knowing
• knowing card
• knowingly
• knowingness
• knowingnesses
• knowing to
• know inside out