1
general::
probably
adverb used when saying that you think something is true or will happen, although it is not completely definite:
• He’s probably gone home. • Rod is probably going to study law. • ‘Is she lying?’ ‘Probably.’
likely
adjective probably going to happen or probably true:
• The most likely result is a win for the Democrats. • The price of petrol is likely to rise again this year. • It is likely that we’ll lose.
it looks as if/it looks like
used when saying that the present situation makes you think that something will probably happen or is probably true:
• It looks like Greg has been delayed. • There aren’t any taxis, so it looks as if we’ll have to walk.
may/could/might well
used when saying that you think something will probably happen or is probably true:
• He may well come back. • Take an umbrella. It might well rain later on. • It may well be his last game.
I would/should think
spoken ( also I would guess spoken ) used when saying that you think something will probably happen or is probably true, although you are not sure:
• ‘Will the match still go ahead?' ’Yes, I would think so .’ • I should think she’s about 24 or 25.
Longman-Thesaurus