Except that "uninterested" and "disinterested" are at least similar in meaning. By that I mean they both at least involve some qualification of having an interest. Ingenious and Ingenuous have nothing whatever to do with each other. What a differenct one letter can make.

On Charles' 2nd point about hearing 'disingenuous' more often, another in that same vane would be the word 'gruntled'. How often have you heard 'gruntled' when describing a happy employee.

>Another example of such words:
>
>"Uninterested" and "disinterested"
>
>
>>Ingenious and Ingenuous are two very different words.
>>
>>The first one we've discussed - clever. The second is almost never used but you will see disingenuous meaning not completely honest. ( but not necessarily in an evil way )