uncompromising, refusing to change one's views or positions; stubbornly resistant to persuasion or compromise
"Despite multiple attempts at negotiation, the two parties remained intransigent, unable to reach a resolution."
Mnemonic: Intransigent breaks into "in-" (not) plus something that sounds like "transact" — picture a rigid negotiator who refuses to transact or budge an inch, arms crossed no matter what's offered.
