Englishundue
adjective
make sure that you can afford the repayments without putting undue strain on your finances:
excessive, extreme, immoderate, intemperate, disproportionate, inordinate;
fulsome, superfluous, too much, too great;
uncalled for, unneeded, unnecessary, nonessential, not required, needless;
unwarranted, unjustified, unreasonable;
inappropriate, unmerited, unsuitable, unseemly, unbecoming, improper, ill-advised.
▷antonyms due, appropriate, proper.