adamant
UK[ˈædəmənt]US[ˈædəmənt]
adj
Determined not to change your mind or to be persuaded about something; refusing to be persuaded.
Etymology
The word 'adamant' has a fascinating journey from a concrete object to an abstract quality. It entered English in the 14th century from Old French 'adamant', which came from Latin 'adamant-', 'adamas', meaning 'the hardest metal' or 'diamond'. The Latin term was itself borrowed from Greek 'adamas' (ἀδάμας), meaning 'unconquerable, inflexible', derived from 'a-' (not) + 'daman' (to conquer, tame). Thus, the literal sense of a material so hard it could not be tamed or broken evolved metaphorically into the modern meaning of an unyielding attitude or firmness of purpose.
Analysis
The word is a simplex loanword from Greek via Latin. Its spelling and form are not productively segmented into meaningful sub-parts in modern English.
Examples
She was adamant that she would not compromise on the safety standards.
Despite the pressure, he remained adamant in his decision.
The government is adamant that the new policy will proceed as planned.