Obscure, kĕlam, gĕlap.
Observe (watch), intei;
(notice), per-hati-kan.
Obstinate, degil, bantak, kras ka-pala.
Obstruct, to, sekat-kan.
Occasion, paksa.
Occupied (busy), ‘aral.
Occur, to, jadi, jatoh, tiba.
Ocean, laut-an.
Odd (of numbers), gasal, ganjil.