unpunctual
He particularly abhorred unpunctuality among his students.
The rail operator is a byword for inefficiency, unpunctuality, poor treatment of passengers, and overcrowding.
She was well aware that she had a reputation for unpunctuality.
His younger sister was always nagging him about unpunctuality for meals.

SMART Vocabulary: related words and phrases

Late
about timephrase
be/come/arrive late to the partyidiom
behindhand
belated
delayed
eleventh
in the nick of timeidiom
last
late adopter
late developer
moment
nick
not a moment too soonidiom
overdue
owl
the last minuteidiom
unearthly
unpunctual
until all hoursidiom
wire