Precarious
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Physically Unstable
Describes objects that might literally fall or collapse. The bookshelf is precarious; it wobbles whenever touched.
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Risky Situations
Often used for situations that can quickly become dangerous or problematic. Crossing the river during the flood is precarious.
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Metaphorical Use
Can describe situations that are unstable but not physically, like a relationship. Their reconciliation is precarious and could end at the smallest disagreement.