It is not un professional , it is unprofessional in a single word without leaving a space.
I think that Thiery Henry of Arsenal is the best football player of the world at this time but the all time favourite is Barcelona's Ronaldinho and many more.
I think that Islam is a tight religion where there are so much restrictions and it more or less favours the man. The woman has to face many hardships remaining in Burkha and all but in it is a very good religion which has not spoilt his power and regulations.
Rectilinear motion means motion in a straight line.For eg. rectilinear propagation of light which says light travels in a straight line.
In tennis to achieve a grand slam a player has to all the four major tournaments that are Australian Open , Wimbledon , French Open or Rolland Garros and U.S. Open in the same year.It is very difficult as there are four different surfaces and to excell in each of them is incredible.