I dont like to hang around him very much, because he can be so negative many times about his petty problems.
The high exchange rate will have a negative effect on our profits.
a) an image in which dark areas represent light ones, and the converse
Geoffrey Riddell […] made a request of him for timber from his woods towards certain edifices going on at . , a great builder himself, disliked the request; could not however give it a negative.
a) To veto
b) To contradict
Wikipedia foundation.