(trendier, trendiest)
1.
If you say that something or someone is ~, you mean that they are very fashionable and modern. (INFORMAL)
...a ~ London night club.
ADJ
2.
If you describe someone who follows new ideas as ~, you disapprove of them because they are more interested in being fashionable than in thinking seriously about these ideas. (INFORMAL)
Trendy teachers are denying children the opportunity to study classic texts.
ADJ: usu ADJ n disapproval