Select the most appropriate ANTONYM of the underlined word in the given sentence.
The library sessions were conducive for healthy discussions.

The word conducive means making a certain situation or outcome likely or possible; favorable or helpful.
Let's look at the meanings of the given options:

Exclusive: Excluding or not admitting other things; restricted to a person, group, or area.

Integrated: Combining or coordinating separate elements so as to provide a harmonious, interrelated whole.

Invaluable: Extremely useful; indispensable.

Unfavourable: Expressing disapproval, or creating a disadvantage; adverse or hindering.

Thus, Unfavourable is the exact antonym of conducive.