casual meeting vs probable meeting

[Borgisson]

Business English Lesson, Advanced Level

ESL/EFL Test #46 "At the Office (2)", question 6

There was no fixed agenda for that particular day as it was to be regarded simply as a ......... meeting.

(a) possible
(b) probable
(c) unplanned
(d) casual

Business English Lesson, Advanced Level

ESL/EFL Test #46 "At the Office (2)", answer 6

There was no fixed agenda for that particular day as it was to be regarded simply as a casual meeting.

Correct answer: (d) casual

Your answer was: incorrect
There was no fixed agenda for that particular day as it was to be regarded simply as a probable meeting.
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Dear Sir/Madame

Why could we not say "probable meeting".

Thank you for your valuable time

Borgisson

[Mister Micawber]

.
'Probable meeting' makes no sense, Borgisson-- the meeting was planned and occurred.
.
_________________
Native English teacher at Mister Micawber's

[Jerryjiang]

i agree that we don't use probable here? but why not using unplanned? thank you

[Mister Micawber]

'A' as the indefinite article does not match 'unplanned'. It would have to read 'an unplanned meeting'.
_________________
Native English teacher at Mister Micawber's