based primarily on surmise rather than adequate evidence;
发音
例句
1. There is something undeniably conjectural about such claims. 这类声明中有些东西绝对是凭空臆测。 2. As regarded its origin there were various explanations, all of which must necessarily have been conjectural. 至于其来源,则有着种种解释,当然都是些臆测。