: not likely to be disputed or to cause strife or quarrel : not relating to or arousing controversy an uncontroversial opinion In all, Hagel should be an uncontroversial choice to head the Pentagon.—

Is it non controversial or uncontroversial?

There is no difference. The words are synonymous. As an AE speaker, I prefer "uncontroversial" or simply "not controversial"; I think you could also use a closed compound (non-hyphenated) form of "noncontroversial," if you did prefer that word.

Whats the meaning of controversial?

: relating to or causing much discussion, disagreement, or argument : likely to produce controversy. See the full definition for controversial in the English Language Learners Dictionary. controversial. adjective. con·​tro·​ver·​sial | \ ˌkän-trə-ˈvər-shəl \