na-adjective, noun
Describes something lacking refinement, delicacy, or polish; can apply to objects, workmanship, or behavior. Rare and somewhat literary.
その陶器は粗笨な作りで、素朴な味わいがある。
The pottery is of crude make, with a rustic charm.
彼の粗笨な態度が周囲の反感を買った。
His coarse attitude earned the dislike of those around him.
粗末 is more common and means 'crude, shabby, poor-quality', often implying cheapness or lack of care, while 粗笨 is rarer and emphasizes lack of refinement or delicacy.
粗野 means 'rough, boorish, uncouth' and is used mainly for behavior or manners, whereas 粗笨 can also describe objects or workmanship.
A Sino-Japanese compound of 粗 (coarse, rough) and 笨 (crude, stupid). The exact historical derivation is uncertain; the word is rare in modern Japanese.