The antonyms for the word "more portending" could be "less significant" or "unpredictable." When something is "less significant," it means that its importance or relevance is minimal, and it does not carry as much weight as something that is more portending. On the other hand, when something is unpredictable, its outcome or impact cannot be foreseen or anticipated, making it difficult to decide its significance. Thus, "less significant" and "unpredictable" can be considered antonyms for "more portending," as they represent contrasting meanings that represent the opposite ends of the spectrum in terms of significance and predictability.