rudimentary

adj.

[1]	fundamental , basic , essential , underlying , elementary , fundamental , rudimental , primary , introductory , abecedarian , formative , first , initial , elemental , primal , seminal
[2]	crude , coarse , unshaped , unfinished , imperfect , primitive , undeveloped , vestigial , embryonic , primordial , immature
[3]	vestigial