grim
adjective
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shockingly repellentghastly
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causing dejectiondark
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filled with melancholy and despondencylow
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not to be placated or appeased or moved by entreaty“grim determination”relentlessunrelentingsternunforgivinginexorableunappeasable
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harshly uninviting or formidable in manner or appearanceforbidding
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harshly ironic or sinisterblack