- feckless
- improvident
- negligent
- thoughtless
Similar to improvidus
- improviso – suddenly, unexpected
- improbitas – depravity
- improbus – bad, bold, impudent, inferior, outrageous, persistent, perverse, self, wicked
- immundus – foul, impure
- fervidus – boiling, excited, fiery, foaming, passionate, seething
- pavidus – dreadful as in producing fear, quaking as in feeling fear
- invidus – envious