primitive

adjective

1
used of preliterate or tribal or nonindustrial societies
primitive societies
2
little evolved from or characteristic of an earlier ancestral type
archaic forms of life
primitive mammals
3
belonging to an early stage of technical development; characterized by simplicity and (often) crudeness
the crude weapons and rude agricultural implements of early man
primitive movies of the 1890s
4
of or created by one without formal training; simple or naive in style
primitive art such as that by Grandma Moses is often colorful and striking

1
a word serving as the basis for inflected or derived forms
`pick' is the primitive from which `picket' is derived
2
a mathematical expression from which another expression is derived
3
a person who belongs to an early stage of civilization

Also useful for “primitive”:Scrabble— High-value letters — see what it scores