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Douglas Harper's Etymology Dictionary
unpunctual

1740, from un- (1) "not" + punctual (adj.).

Wiktionary
unpunctual

a. Not punctual.

WordNet
unpunctual

adj. not punctual; after the appointed time [ant: punctual]

Usage examples of "unpunctual".

Clare,--gay, easy, unpunctual, unpractical, sceptical,--in short,--walking with impudent and nonchalant freedom over every one of her most cherished habits and opinions?

Your mother is notoriously unpunctual but even she could not carry a child for five hectodays.

Mead pointed out how bad Edwins work habits were, how unpunctual he was, how young and fallow.

This led the conversation back to Greyshot, and they lingered so long round the fire talking that Raeburn was for once unpunctual, and kept an audience at least ten minutes waiting for him.

Prince Edward was so eager to be secret hunting that he wanted to give up all else, but his brother warned him that if he were unpunctual for even one meal, he would be banned from going below.

Sabauda was later still, and over the next forty minutes she allowed herself to work up a fine head of steam about the lack of consideration shown by unpunctual people.