I think Erngath has got it right; I'm with him on the synonym; unless you can show us where we are going wrong.
Not that it really matters.
Synonyms and Antonyms of probably
by reasonable assumption <we would probably win that bet>
Synonyms assumably, doubtless, likely, presumably
Related Words maybe, mayhap, perchance, perhaps, possibly; conceivably, imaginably, plausibly, practically, reasonably; potentially; assuredly, certainly, clearly, conclusively, decisively, definitely, definitively, indisputably, indubitably, positively, really, surely, truly, undeniably, undoubtedly, unquestionably; presumedly, supposably, supposedly
Phrases as like as not (or like as not)
Near Antonyms implausibly, inconceivably, incredibly, unbelievably, unthinkably
Antonyms improbably
http://www.merriam-webster.com/thesaurus/probably
Thanks. The two words 'probable' and 'perhaps' have quite different meanings. They are most certainly NOT synonyms.
Erngath wrote: "Just pointing out that probably is a
synonym of perhaps".
Look above.
'Probably' is in the above list as a SYNONYM (Same as or similar meaning) with: assumably, doubtless, likely, presumably. The meaning is that something is
very likely, probable to happen.
'Perhaps' does NOT carry the same or similar meaning as 'probably'. It is therefore NOT a Synonym.
Compare:
"It's probable that the Conservatives will win the next General Election" with
"Perhaps UKIP or the Greens will win the next General Election".
Words like 'improbable' and 'implausible' are shown as ANTONYMS (i.e. opposites to 'probable'), meaning that something is
unlikely to happen.
I thought Erngarth meant that the words 'probable' and 'perhaps' have similar meaning, which clearly they do not.
I will cheerfully concede, though, that the two words 'probably' and 'perhaps' are not strictly opposites, or antonyms, either.
All of the above words are about the likelihood, or chance, of something happening.
Strictly speaking, therefore, it is classed as a 'related' word, therefore neither synonym nor antonym of 'probably'.
I hope that clears it up