Ingenious vs Ingenuous: Which One Do You Need?
Ingenious means clever. Ingenuous means innocent and open.
An ingenious solution. An ingenuous smile.
The test that settles it
Look for the i before the ending. Ingenious is the clever one, and it shares that i with genius.
“an ___ design” → clever, so ingenious.
“an ___ young man” → guileless, so ingenuous.
Ingenious: inventively clever
Showing skill and originality in solving a problem. It describes people, plans and devices.
An ingenious piece of engineering.
She found an ingenious way round it.
The plot is ingenious.
Swap in clever. If it works, ingenious.
Ingenuous: open and unsuspecting
Innocent to the point of naivety, and incapable of concealment. It describes people and their manner, never objects.
An ingenuous reply that gave everything away.
He is too ingenuous for this business.
Her ingenuous delight was disarming.
Swap in guileless. If it works, ingenuous.
Side by side
| Ingenious | Ingenuous |
|---|---|
| Clever | Guileless |
| People, plans, objects | People only |
| Shares the i of genius | Shares the root of genuine |
| An ingenious device | An ingenuous question |
The exception
Disingenuous — pretending to be more innocent than you are — is now far more common than ingenuous itself.
It is a precise and rather damning word: it accuses someone of feigning naivety, which is worse than simply lying.
Where people get it wrong
| Incorrect | Correct | Why |
|---|---|---|
| an ingenuous solution | an ingenious solution | Clever. |
| She was ingenious about her motives. | She was ingenuous about her motives. | Open, not clever — or disingenuous if she was faking it. |
| a disingenious argument | a disingenuous argument | The word is built on the innocent one. |
| ingenius | ingenious | It looks like genius but keeps the o. |
Practice — choose the right word, then check yourself.
- The lock is an ___ piece of design.
- His ___ honesty startled the room.
- That defence was frankly ___.
- An ___ shortcut saved hours.
- She asked with ___ curiosity.
Show the answers
1. ingenious 2. ingenuous 3. disingenuous 4. ingenious 5. ingenuous
Frequently asked
Which will I actually need?
Ingenious in most writing, and disingenuous in argument. Plain ingenuous is now rather literary.
Do they share a root?
Both come from Latin ingenium, natural capacity — which split into inborn cleverness and inborn frankness.
More words people confuse
