Vulnerable
Definition 1 of 4
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Emotional Impact
'Vulnerable' often evokes sympathy; it suggests someone can be hurt easily. The homeless are particularly vulnerable during cold winters.
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Connotation of Weakness
It implies a weakness or lack of protection, not just physical, but in various situations. As a small company, we're vulnerable in a market dominated by giants.
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Non-literal Use
Used metaphorically, it can describe something threatened, not physically weak. This policy leaves our environmental laws vulnerable.