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obstinate holding stubbornly to one's own ideas or purposes; unwilling to change. [2 definitions]
obstreperous hard to control, as children resisting adult discipline; unruly. [2 definitions]
obstruct to clog or block. [3 definitions]
obstruction something that obstructs; obstacle or impediment. [3 definitions]
obstructionist anyone who deliberately prevents the ordinary conduct of affairs.
obtain to gain possession of; acquire. [2 definitions]
obtainable combined form of obtain.
obtrude to thrust or force (oneself, one's concerns, or one's opinions) on another or others without being asked. [3 definitions]
obtrusive attracting unwanted notice. [3 definitions]
obtuse of an angle, greater than ninety degrees and less than 180 degrees. [3 definitions]
obtuse angle an angle greater than 90 degrees and less than 180 degrees.
obverse the face, front, or principal surface of anything, esp. of a coin, medal, or the like. (Cf. reverse). [5 definitions]
obviate to prevent or eliminate in advance; render unnecessary or irrelevant.
obvious easily understood, recognized, or seen; apparent. [2 definitions]
obviously in a way that is easy to see or understand; clearly.
oc- to. [3 definitions]
ocarina a small wind instrument that has a small mouthpiece and finger holes, is shaped somewhat like an elongated potato, and produces soft, hollow sounds.
occasion an incident or event, or the time at which it happens. [5 definitions]
occasional occurring infrequently or irregularly. [3 definitions]
occasionally at times; now and then; infrequently.
occident (cap.) the countries of Europe and the Western Hemisphere (usu. prec. by the).