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formidable
['fɔrmədəbəɫ]
the formidable prospect of major surgery
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redoubtable
[rə'daʊtəbəɫ]
"a tougher and more redoubtable adversary than the heel clicking , jackbooted fanatic" - G.H.Johnston
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unnerving
[ə'nɝvɪŋ]
something unnerving and prisonlike about high grey wall