A spokesperson declined to speculate on the cause of the plane crash.
Synonyms and examplesguessGuess who called yesterday?
estimateThey estimate that the work will take at least ten weeks.
divineformalMum had divined my state of mind rather shrewdly.
surmiseformalFrom the expression on his face, she surmised that something bad had happened.
conjectureformalIt would be reasonable to conjecture that lack of exercise contributed to his obesity.
Go to the thesaurus article about these synonyms and antonyms ofspeculate.
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If youguesssomething, you give an answer to a question without being certain that you are right.