speculate
动词 speculate:
to believe especially on uncertain or tentative grounds
同义词:theorize, theorise, conjecture, hypothesize, hypothesise, hypothecate, suppose
talk over conjecturally, or review in an idle or casual way and with an element of doubt or without sufficient reason to reach a conclusion
reflect deeply on a subject
同义词:chew over, think over, meditate, ponder, excogitate, contemplate, muse, reflect, mull, mull over, ruminate
invest at a risk
同义词:job