Here's what rhymes with ungrounded.

Consider these alternatives

vexatious / basis fallacious / basis unfounded / confounded overreach / need unverifiable / viable specious / pieces juvenilia / criteria insincere / will misreadings / proceedings illogical / logical ahistorical / historical antithetical / theoretical unrealizable / advisable insinuations / relations antidemocratic / democratic suppositions / conditions impudent / student untrue / you