What are some adjectives and verbs that begin with the letter O?

* obedient * obscure * obese * objective * obligatory * oblivious * obvious * obscene * obnoxious * observant * obsessive * obsolete * obstinate * obtuse * obstreperous * ostentatious * obtrusive * obtainable * odd * obvious * occasional * occupying * oedipal * official * offensive * oily * olive * olfactory * old * ordinary * opalescent * opportunistic * orbital * optimistic * ocular * ornamental * organic * original * oriental * orotund * outright * overexcited * owlish * oviparous