- 1(of an action, etc.) so bad, immoral, etc. that it should make you feel ashamed It would be unconscionable for her to keep the money.
- 2(often humorous) too great, large, long, etc. synonym excessive You take an unconscionable amount of time getting dressed!
NAmE//ʌnˈkɑnʃənəbl//[usually before noun] (formal)