In-let, ffrydle, adwy
In-mate, llettywr, cytty
In-most, nesaf i fewn, dyfnaf
In-ner, tufewnol
In-quest, chwiliad, rhaithholiad
In-quire, ymofyn, holi
In-road, ymgyrch, rhuthrgyrch
In-sane, gwallgofus
In-scribe, arysgrifenu; cyflwyno
In-sect, trychbryfyn, trychfilyn