What is the opposite of make certain?

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

Verb
Opposite of to establish or make a determination on the nature of someone or something
“Many people mistake the endangered water vole for the brown rat and accidentally poison them or disturb their burrows.”
Verb
Opposite of to make sure or certain of something
“He had a tendency to be derelict and neglect his duty in ensuring that the equipment operated at full capacity.”
Phrase
Opposite of to ensure or verify
“Because she has helped us before, it would be logical to assume that she will help us again.”
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