unsupportive

adjective

1. giving support.
2. providing sympathy or encouragement: His family was supportive of his attempts to be a writer.
3. providing additional help, information, etc.; auxiliary: manufacturers of supportive materials.
4. Medicine/Medical. helping to maintain a normal physiological balance, as by the intravenous administration of required nutriment.

adjective

1. providing support, esp moral or emotional support

adj.1590s, from support + -ive. Called “rare” in OED (1933). Related: Supportively; supportiveness.