smadi gismu

x1 guesses/conjectures/surmises x2 (du'u) is true about subject x3; [epistemology].

Also: x1 has a hunch that x2 is true; x1 imagines x2 is true; words usable for epistemology typically have a du'u place. See also djuno, facki, jijnu, sruma.

In notes:

djuno
x1 knows fact(s) x2 (du'u) about subject x3 by epistemology x4.
facki
x1 discovers/finds out x2 (du'u) about subject/object x3; x1 finds (fi) x3 (object).
jijnu
x1 (person) intuits x2 (du'u) about subject x3; [epistemology].
sruma
x1 assumes/supposes that x2 (du'u) is true about subject x3; [epistemology].
dejru'a
s1=d1 wagers d2 to creditor d3 on s2 (du'u).
kesyjetske
saske1 is astrology (mass of facts) of subject matter saske2 based on methodology saske3=jetnu1 of celestial bodies
smadyfi'a
x1 is speculative fiction about plot/theme/subject x2 by author x3