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hasty
['heɪsti]
"hasty makeshifts take the place of planning" - Arthur Geddes
"hasty marriage seldom proveth well" - Shakespeare
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overhasty
rejected what was regarded as an overhasty plan for reconversion
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precipitant
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precipitate
[prɪ'sɪpɪˌteɪt]
wondered whether they had been rather precipitate in deposing the king
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precipitous
[prɪ'sɪpɪtəs]