The phrase 'without assurances' is correct and usable in written English.
It is usually used to convey a lack of certainty or trust in a promise or situation. For example, "I can't agree to the plan without assurances that it will be successful."
Mr. Gensler briefly considered proceeding, even without assurances, to force Mr. Wetjen's hand.
Whitaker responded that he would not come Friday without assurances that he won't be subpoenaed.
"Therapies should not be started without assurances that there can be follow-up.
"Can class size be increased without assurances that jobs will be available for the increased number of graduates?
There are also teams that would acquire Paul without assurances, on the belief that they can sell him on staying.
Gorbachev, however, could not afford to continue down the path to reform without assurances about national security.
Even so, Russian mobilisation was reckless, and would have been inconceivable without assurances of more or less unconditional support from France in the Balkans.
Like many star players, he is said to be wary of coming to New York without assurances that another elite player would join him.
Ordinarily, players whose objectives are different are reluctant to make big investments without assurances that others in the network will back them.
No reasonable person, who has the benefit of advice from counsel, would submit to questioning in such a highly politicized, witch hunt environment without assurances against unfair prosecution.
Senate Democrats had urged Mr. Trump not to withhold certification, and they are unlikely to agree to legislation without assurances that the deal will remain intact.
