What is a less developed country?

Less developed country can be categorised in following ways such as.
A country showing:
(1) a poverty level of income
(2) a high rate of population increase
(3) a substantial portion of its workers employed in agriculture,
(4) a low proportion of adult literacy,
(5) high unemployment,
(6) a significant reliance on a few items for export. Terms such as third world, poor, developing nations, and underdeveloped have also been used to describe less developed countries.