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grim
['grɪm]
grim determination
grim necessity
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inexorable
[ˌɪ'nɛksɝəbəɫ]
Russia's final hour, it seemed, approached with inexorable certainty
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relentless
[rɪ'ɫɛntɫɪs]
relentless persecution
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stern
['stɝn]
the stern demands of parenthood
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unappeasable
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unforgiving
[ənfɝ'gɪvɪŋ]
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unrelenting
[ˌənri'ɫɛntɪŋ]