( formal ) large; large enough to be considered important :
We have spent a not inconsiderable amount of money on the project already.
( formal ) large; large enough to be considered important :
We have spent a not inconsiderable amount of money on the project already.
Oxford Advanced Learner's English Dictionary. Оксфордский английский словарь для изучающик язык на продвинутом уровне. 2005