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prebiological
prebiotic
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precancerous
precarious
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precarious

pre·car·i·ous [ prə kérree əss ]


adjective 
Definition:
 
1. unsafe: dangerously unstable, unsteady, uncertain, or insecure

2. not well founded: based on uncertain premises or unwarranted assumptions ( formal )

[Mid-17th century. < Latin precarius "depending on entreaty, uncertain"]

pre·car·i·ous·ly adverb
pre·car·i·ous·ness noun
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