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.

Adjective
Opposite of easily perceived
Adjective
Opposite of easy to understand
“It is a complicated problem that will require a bit of mulling over.”
Adjective
Opposite of well-defined
Adjective
Opposite of firm, strong, or substantial
“From years of decay, the columns holding the structure together appear to be fragile.”
Adjective
Opposite of sharp and clear with no fuzziness
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