Something seemingly true appears to be true. Use the adverb seemingly when you want to say "on the face of it" or "apparently."
The word seemingly refers to how things look on the surface — how they seem — and it often suggests there's more to the story. A seemingly broken ankle might actually be sprained, and a seemingly rich man might actually be deeply in debt. While your dog is seemingly well-behaved, he may be eating the garbage when you're not home. Seemingly means about the same as apparently, ostensibly, or surely.