conjecture，surmise，guess，guesswork，hypotheses ；

[例句] 韦克厄姆先生把这些报道当作臆测而不予考虑。 Mr Wakeham dismissed the reports as speculation.

[例句] 关于这个问题不可臆测. No conjecture can be offered on the subject.

assume，suppose，forejudge ；

[例句] 你这样臆断是错了. You were mistaken in assuming it.

[例句] 这份报告建立在谣言、臆断和含沙射影的基础之上。 The report was based on rumours, speculation, and innuendo.

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