For the longing/nostalgia aspect:
* Cheerfully: This suggests a happy and upbeat feeling, the opposite of wistful longing.
* Hopefully: This suggests an optimistic outlook rather than a wistful yearning for the past.
* Pragmatically: This implies a focus on the present and practicalities, rather than dwelling on past dreams.
For the pensive/melancholy aspect:
* Energetically: This suggests a lively and enthusiastic feeling, the opposite of wistful melancholy.
* Joyfully: This suggests a feeling of pure happiness, contrasting with the wistful sadness.
* Positively: This implies a hopeful and optimistic perspective, the opposite of wistful pessimism.
For the dreamy/reflective aspect:
* Concretely: This suggests a focus on reality and specifics, the opposite of wistful daydreaming.
* Objectively: This implies an impartial and factual approach, contrasting with wistful subjectivity.
* Actively: This suggests taking action and engaging with the present, the opposite of wistful contemplation.
Ultimately, the best opposite for "wistfully" depends on the specific context and the nuance you want to convey.