certainly vs probably
- definitely or positively (`sure' is sometimes used informally for `surely')
She has certainly branched out into more interesting work in recent years.
I'd say name it except for your second point, that named Wealden brachiosaurids are plentiful and once better material is described, some would near certainly be synonymized.
A drunk was standing in the middle of the street, swaying uncertainly and trying hard to stay upright.
- with considerable certainty; without much doubt
- easy to believe on the basis of available evidence
I badly wanted the job, but knew that my age would probably tell against me.
He asked me bluntly, ‘Why would you want to leave private life and take on such a difficult, dangerous and probably thankless job?’
On the other hand, a blazer and slacks would probably be acceptable.