Antonyms of adj prohibitory

1 sense of prohibitory

Sense 1
prohibitive, prohibitory -- (tending to discourage (especially of prices); "the price was prohibitive")

INDIRECT (VIA preventive) -> permissive -- (not preventive)

Similarity of adj prohibitory

1 sense of prohibitory

Sense 1
prohibitive, prohibitory -- (tending to discourage (especially of prices); "the price was prohibitive")
       => preventive (vs. permissive), preventative -- (tending to prevent or hinder)