unprepared
He didn't seem anxious about our state of unpreparedness for the number of guests who were due to arrive the following day.
Much of the unpreparedness is due to bureaucratic conflicts between the Welsh Office and the Department of Health.
The whole event went off relatively smoothly despite dire predictions of chaos and unpreparedness.

SMART Vocabulary: related words and phrases

Not expected or planned
abrupt end
abrupt halt
abruptly
abruptness
ad hoc
inadvertence
inadvertency
inadvertent
inadvertently
inconceivable
sharpness
sine die
spirit
spontaneity
spontaneous
unsuspected
untimely
untoward
unwilled
unwitting