What is the opposite of well defined?

Need antonyms for well defined? Here's a list of opposite words from our thesaurus that you can use instead.

(of statements or instructions) Opposite of precise and clear
“He's a good worker, but he will not understand what needs to be done if you give him vague instructions.”
Opposite of easy to understand
“It is a complicated problem that will require a bit of mulling over.”
Opposite of well-defined
Opposite of firm, strong, or substantial
“From years of decay, the columns holding the structure together appear to be fragile.”
Opposite of sharp and clear with no fuzziness
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