What do you call a sentence without commas?

Answer 1

Are you referring to "run-on sentences"? A run-on sentence is one where it is a compound sentence (two subjects and two predicates, which could function as two separate sentences) yet a separation is not made between them. Example: Original: I went to the store. I bought food there. Run-on: I went to the store and I bought food there. Correct: I went to the store, and I bought food there. You could also remove the subject from the second part and that would remove the need of a comma. Example: I went to the store and bought food there. In this case, the sentence is correct because the same subject is applied to both predicates. To say "I went to the store. Bought food there," would result in an incomplete sentence, one which when added to the first can not result in a run-on. (Note: In this case, you may not say "I went to the store, and bought food there," because then you are creating a separation between the two parts of the sentence resulting in the lack of an identified subject for the latter part.)

Answer 2

A sentence without commas is a simple sentence, but it can also be called a comma splice if it improperly joins two independent clauses.

Answer 3

You seem to be describing a phrase.