| Infinitive | stiff-arm |
|---|---|
| 3rd person singular | stiff-arms |
| Past | stiff-armed |
| Past Participle | stiff-armed |
| Present Participle | stiff-arming |
| Infinitive | stiff-arm |
|---|---|
| 3rd person singular | stiff-arms |
| Past | stiff-armed |
| Past Participle | stiff-armed |
| Present Participle | stiff-arming |