Hi ribeiro, they are adjectives with almost the same meaning.... Complicated
made of many different things or parts that are connected; difficult to understand
The story is extremely complicated.Tricky
1 (rather informal
) difficult to do or deal with
a tricky situation
Getting it to fit exactly is a tricky business.
The equipment can be tricky to install.
2 (of people) clever
but likely to trick you
Although in Portuguese both could be translated as "complicado"
Tricky is quite informal, complicated can be formal or not.
You can see in te 2nd translation of "tricky" the adjective clever
, that's my tip sometimes tricky can mean.... Difícil porque é sagaz, perspicaz, cheio de sutilezas;
Complicated é complexo, com muitas partes, pode ser bem mais complicado