"Tamer is a good neighbor."
Translation:تامِر جار جَيِّد.
There are two marks above the letter 'ya'. The one that looks like 'w' is called syaddah, which signifies double letter. The other mark determine the vocal component, and since it is a line below the syaddah, then it is a 'kasrah' line, denoting the vocal letter 'i'. So it is jayyid, not jayyad. If the line is above the syaddah mark, then it denotes a 'fathah', and will correctly be pronounced jayyad.