Not clear because it can be understood in more than one way. It leaves room for different interpretations or causes uncertainty.
From Latin *ambiguus* (“doubtful, having a double meaning”), from *ambi-* (“both”) and *agere* (“to drive, lead”). It suggests something that can “go both ways” in meaning.
An ambiguous sentence is like a road sign pointing in two directions at once. Your brain has to choose a path, and sometimes different readers choose differently. That’s why instructions, laws, and exam questions try so hard not to be ambiguous.
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