Not favourable, in various senses. Of persons, opinions, etc.

Of a report, opinion, etc.: characterized by deep suspicion or mistrust; unfavourable. Obsolete.

Engaged in shaking one's head, esp. to express disapproval, disagreement, sorrow, etc.; (hence) having a negative or disapproving attitude. Also…

That disapproves; that conveys or implies disapproval.

Characterized by, expressing, or feeling disapprobation; conveying or implying disapproval; (in later use) esp. strongly disapproving.

= negative, adj.

(un-, prefix1 affix 4.)

Characterized by or expressing disapprobation; conveying or implying disapproval. Cf. disapprobatory, adj.

Disapproving, rebuking.

Of an attitude, opinion, response, etc.: critical, unfavourable, carping; hostile, destructive, antagonistic. Also of a person: having such an…