Present
| I | dumbfound |
| You | dumbfound |
| She | dumbfounds |
| We | dumbfound |
| They | dumbfound |
Past
| I | dumbfounded |
| You | dumbfounded |
| She | dumbfounded |
| We | dumbfounded |
| They | dumbfounded |
Perfect
| I | have | dumbfounded |
| You | have | dumbfounded |
| She | has | dumbfounded |
| We | have | dumbfounded |
| They | have | dumbfounded |
Future
| I | will | dumbfound |
| You | will | dumbfound |
| She | will | dumbfound |
| We | will | dumbfound |
| They | will | dumbfound |
Past Perfect
| I | had | dumbfounded |
| You | had | dumbfounded |
| She | had | dumbfounded |
| We | had | dumbfounded |
| They | had | dumbfounded |
Future Perfect
| I | will | have | dumbfounded |
| You | will | have | dumbfounded |
| She | will | have | dumbfounded |
| We | will | have | dumbfounded |
| They | will | have | dumbfounded |
Present - Conditional
| I | would | dumbfound |
| You | would | dumbfound |
| She | would | dumbfound |
| We | would | dumbfound |
| They | would | dumbfound |
Perfect - Conditional
| I | would | have | dumbfounded |
| You | would | have | dumbfounded |
| She | would | have | dumbfounded |
| We | would | have | dumbfounded |
| They | would | have | dumbfounded |