undue - unreasonable, unnecessary, unwarranted, undeserving⏎
revoke - cancel, not retain, end validity of⏎
vacant - empty, not being used⏎
unofficial - illegal, independent, unauthorised, unauthorized⏎
secure - safe, protected, achieve (something)⏎
segment - division, divide, part of something⏎
special - unusual, chosen, out of the ordinary⏎
training - learning, development, course, trainings, coaching, mentoring⏎
upkeep - maintenance, preservation⏎
temporary - short-term, non-permanent, makeshift⏎