I found this phrase from a book I am reading now. "Tommy did not seem at all dejected." It sounded unnatural to me. And why not something like "Tommy did not seem dejected at all." I feel like more familiar in this way. Am I wrong? or up to writer's choice? Thank you.
Usually there is flexibility about where adverbs go, e.g.
You can say, 'John slowly walked towards me' or 'John walked towards me slowly.' The first emphasises 'slowly' somewhat whereas the second emphasises 'walked', and 'slowly' is something of an afterthought.
In exactly the same way, it is perfectly acceptable to say, 'Tommy did not seem at all dejected' or 'Tommy did not seem dejected at all.'
All of the above versions are grammatically correct and it is a matter of judgement by the author which to use.