| adjective | not to be placated or appeased or moved by entreaty “grim determination” |
| adjective | impervious to pleas, persuasion, requests, reason; ; - W.Churchill “he is adamant in his refusal to change his mind” |
| grimness | noun | something hard to endure |
| inexorableness | noun | mercilessness characterized by an unwillingness to relent or let up |
| inexorability | noun | mercilessness characterized by an unwillingness to relent or let up |
| relentlessness | noun | mercilessness characterized by an unwillingness to relent or let up |
| sternness | noun | uncompromising resolution |
| adamance | noun | resoluteness by virtue of being unyielding and inflexible |
| intransigency | noun | the trait of being intransigent; stubbornly refusing to compromise |
| intransigence | noun | the trait of being intransigent; stubbornly refusing to compromise |