Opposite in meaning of the word ''Obsequious''?

(OD) Obsequious= obedient or attentive to an excessive or servile degree, Sycophantic= behaving or done in an obsequious way in order to gain advantage, Presumptuous= failing to observe the limits of what is permitted or appropriate, Brownnosing= acting very obsequiously, Submissive= ready to conform to the authority or will of others, meekly obedient or passive.