SYN: Prove, verify, find out, discover, confirm, detect, determine, learn, discern.
ANT: Guess, conjecture, surmise, suppose, presume.
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KEY: Ascribe.
SYN: Assign, attribute, impute, refer, render, allege, charge.
ANT: Deny, refuse, exclude, dissociate, disconnect, dissever.
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KEY: Askant.
SYN: Away, askew, asquint, obliquely, aslant.
ANT: Straightforwards, forwards, rectilinearly, ahead, straight.