From support +‎ -ive.

• (General American) IPA^(key): /səˈpɔɹtɪv/
• (Received Pronunciation) IPA^(key): /səˈpɔːtɪv/

• Audio (Southern England):

  (file)

• (rhotic, without the horse–hoarse merger) IPA^(key): /səˈpo(ː)ɹtɪv/
• (non-rhotic, without the horse–hoarse merger) IPA^(key): /səˈpoətɪv/
• Hyphenation: sup‧por‧tive

supportive (comparative more supportive, superlative most supportive)

1. Providing support.

   Antonym: unsupportive

   I had a very supportive coach who helped me.

   • 2023 February 22, Sir Michael Holden, “Comment: A farewell to micro-management”, in RAIL, number 977, page 3:

     But the most seismic change is the shift to being supportive of open access. In practice, most of the industry has collectively opposed this for the past 25 years. The Department for Transport has been particularly hostile, seeing it as little more than cherry-picking.

• supportful

• unsupportive