The past tense of unstiffen is unstiffened
| Infinitive | to unstiffen |
| Present Tense | unstiffen / unstiffens |
| Past Tense | unstiffened |
| Present Participle | unstiffening |
| Past Participle | unstiffened |
| Singular | Plural |
|---|---|
| I unstiffen | We unstiffen |
| You unstiffen | You unstiffen |
| He/She/It unstiffens | They unstiffen |
| Singular | Plural |
|---|---|
| I am unstiffening | We are unstiffening |
| You are unstiffening | You are unstiffening |
| He/She/It is unstiffening | They are unstiffening |
| Singular | Plural |
|---|---|
| I have unstiffened | We have unstiffened |
| You have unstiffened | You have unstiffened |
| He/She/It has unstiffened | They have unstiffened |
| Singular | Plural |
|---|---|
| I have been unstiffening | We have been unstiffening |
| You have been unstiffening | You have been unstiffening |
| He/She/It has been unstiffening | They have been unstiffening |
| Singular | Plural |
|---|---|
| I unstiffened | We unstiffened |
| You unstiffened | You unstiffened |
| He/She/It unstiffened | They unstiffened |
| Singular | Plural |
|---|---|
| I was unstiffening | We were unstiffening |
| You were unstiffening | You were unstiffening |
| He/She/It was unstiffening | They were unstiffening |
| Singular | Plural |
|---|---|
| I had unstiffened | We had unstiffened |
| You had unstiffened | You had unstiffened |
| He/She/It had unstiffened | They had unstiffened |
| Singular | Plural |
|---|---|
| I had been unstiffening | We had been unstiffening |
| You had been unstiffening | You had been unstiffening |
| He/She/It had been unstiffening | They had been unstiffening |
| Singular | Plural |
|---|---|
| I will unstiffen | We will unstiffen |
| You will unstiffen | You will unstiffen |
| He/She/It will unstiffen | They will unstiffen |
| Singular | Plural |
|---|---|
| I will be unstiffening | We will be unstiffening |
| You will be unstiffening | You will be unstiffening |
| He/She/It will be unstiffening | They will be unstiffening |
| Singular | Plural |
|---|---|
| I will have unstiffened | We will have unstiffened |
| You will have unstiffened | You will have unstiffened |
| He/She/It will have unstiffened | They will have unstiffened |
| Singular | Plural |
|---|---|
| I will have been unstiffening | We will have been unstiffening |
| You will have been unstiffening | You will have been unstiffening |
| He/She/It will have been unstiffening | They will have been unstiffening |
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