General Antonyms:
* Auspiciousness: A favorable or promising sign.
* Favorable omen: A sign that something good is likely to happen.
* Hopeful sign: A sign that inspires optimism.
* Good fortune: Luck, success, or prosperity.
* Prosperity: A state of flourishing, thriving, and success.
* Blessing: Something good that is received.
* Encouraging sign: A sign that inspires confidence or hope.
* Favorable circumstance: A condition that is helpful or beneficial.
Specific Antonyms (related to meaning):
* Reassurance: Something that makes someone feel confident and safe.
* Comfort: A feeling of ease and contentment.
* Peace: A state of tranquility and harmony.
* Tranquility: A state of calmness and peace.
* Harmony: A state of agreement and peace.
Opposite in context:
* Positive: Having a good or beneficial effect.
* Optimistic: Hopeful and confident about the future.
The best antonym for "portent" will depend on the specific context in which the word is used.