Terms for subject Informal containing only one

English	Russian
one and only	разъединственный (Andrey Truhachev)
one and only	разъединый
one and only	один-разъединственный (Andrey Truhachev)
one and only	любимый
one who has only book knowledge	книжник
one who looks out only for himself	шкурник
one who looks out only for himself	шкурник
only on one condition	только уговор (Technical)
only one	разъединственный
the only one	один-разъединственный (Andrey Truhachev)
the only one	разъединственный (Andrey Truhachev)