Prepositions after adjectives: O

obedient-to-unto-in-by, of "objective in" or "objective about"? "obligatory for" or "obligatory on"? "oblivious to" or "oblivious of"? observable in, by, from, to or on? obsessed with, by, about, in or over? obsessive about, in, over, with or to? "obsolete in" or "obsolete by"? "obtainable in" or "obtainable from"? "obvious to", "obvious from" or "obvious in"? odd to, for, about, in or on? offensive to, in, against, on or about? official with, in, for, on or at? "off-limits to" or "off-limits for"? "okay with" or "okay for"? "ok with" or "ok for"? old in, with, for, at or of? "ongoing in" or "ongoing for"? "online at" or "online for"? "only because" or "only by"? onstage at, with, in, for or by? "open to" or "open for"? "operational in" or "operational by"? operative in, for, with, on or at? "opposite to" or "opposite in"? optimal for, in, from, to or on? optimistic about, of, in, for or on? "optional on" or "optional for"? "ordinary in" or "ordinary for"? "original in", "original with" or "original to"? other in, for, on, with or of? "outraged by" or "outraged at"? outside in, with, of, to or for? "outspoken about", "outspoken on" or "outspoken in"? outstanding in, for, at, on or to? overcome with overdue for, in, with, on or by? "overjoyed at" or "overjoyed with"? "overwhelmed with" or "overwhelmed by"? overwhelming for, to, in, at or with?