Oegentlig, improper.
Oemotståndlig, irresistible.
Oemotsäglig, indisputable.
Oemottaglig, impervious, insusceptible.
Oenighet, variance, discord.
Oense, vara —, to disagree.
Oerfaren, inexperienced.
Oerhörd, unheard of, enormous.
Oersättlig, irreparable.
Ofantlig, enormous, excessive.