issi SUFFIX
-est, most ~, much ~, makes SUPER;
ignotissi.mo ADJ 0 0 DAT S M SUPER
ignotissi.mo ADJ 0 0 DAT S N SUPER
ignotissi.mo ADJ 0 0 ABL S M SUPER
ignotissi.mo ADJ 0 0 ABL S N SUPER
ignotus, ignota, ignotum ADJ [XXXAX]
unknown, strange; unacquainted with, ignorant of;
issi SUFFIX
makes a verb PERF PPL into an adjective SUPER (amat.issimus => most/much loved)
ignotissi.mo ADJ 0 0 DAT S M SUPER
ignotissi.mo ADJ 0 0 DAT S N SUPER
ignotissi.mo ADJ 0 0 ABL S M SUPER
ignotissi.mo ADJ 0 0 ABL S N SUPER
ignosco, ignoscere, ignovi, ignotus V (3rd) [XXXBX]
pardon, forgive (with DAT);

Credits:
This, our local install of the popular standby Whitaker's Words, is possible thanks to the resurrection of the venerable project at William Whitaker's Words, where you will also find extensive documentation. The corresponding GitHub repository is where you can submit issues about missing forms and analyses.
This web interface by Walter M. Shandruk.