Antonyms of adj respectful

2 senses of respectful

Sense 1
respectful (vs. disrespectful) -- (full of or exhibiting respect; "respectful behavior"; "a respectful glance")

disrespectful (vs. respectful) -- (exhibiting lack of respect; rude and discourteous; "remarks disrespectful of the law"; "disrespectful in the presence of his parents"; "disrespectful toward his teacher")
        => annihilating, devastating, withering -- (making light of; "afire with annihilating invective"; "a devastating portrait of human folly"; "to compliments inflated I've a withering reply"- W.S.Gilbert)
        => contemptuous, disdainful, insulting, scornful -- (expressing extreme contempt)
        => contumelious -- (arrogantly insolent)
        => derisive, gibelike, jeering, mocking, taunting -- (abusing vocally; expressing contempt or ridicule; "derisive laughter"; "a jeering crowd"; "her mocking smile"; "taunting shouts of `coward' and `sissy'")
        => impious, undutiful -- (lacking due respect or dutifulness; "impious toward one's parents"; "an undutiful son")
        => impudent, insolent, snotty-nosed, flip -- (marked by casual disrespect; "a flip answer to serious question"; "the student was kept in for impudent behavior")
        => undeferential -- (not showing courteous respect)

Sense 2
respectful, reverential, venerating -- (feeling or manifesting veneration)

INDIRECT (VIA reverent) -> irreverent -- (showing lack of due respect or veneration; "irreverent scholars mocking sacred things"; "noisy irreverent tourists")

Similarity of adj respectful

2 senses of respectful

Sense 1
respectful (vs. disrespectful) -- (full of or exhibiting respect; "respectful behavior"; "a respectful glance")
       => deferent, deferential, regardful -- (showing deference)
       => honorific -- (conferring or showing honor or respect; "honorific social status commonly attaches to membership in a recognized profession")
          Also See-> courteous#2; humble#2; reverent#1

Sense 2
respectful, reverential, venerating -- (feeling or manifesting veneration)
       => reverent (vs. irreverent) -- (feeling or showing profound respect or veneration; "maintained a reverent silence")