Is there a past tense for the word remiss?

The word "remiss" is already in the past tense. It is the past participle of the verb "remit," meaning "to neglect or fail to do something."

While there is no separate past tense form, you can use the following:

* "was remiss" - This is the simple past tense form of "to be" combined with the past participle "remiss."

* "have been remiss" - This is the present perfect tense, used to indicate an action that started in the past and continues to the present.

For example:

* "I was remiss in not sending you a thank-you note."

* "I have been remiss in my duties lately."