rudimentary

basic or undeveloped

Root

rud: rough, raw, or untrained

Other words with the rud root

erudite: learned or scholarly
erudition: deep learning or scholarship
rude: rough, crude, or unrefined
rudiment: a basic beginning or undeveloped part

Rudimentary knowledge is still in the rough beginning stage.

She had only a rudimentary grasp of statistics.

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