"ruder" in the adjective sense

1. ill-mannered, bad-mannered, rude, unmannered, unmannerly

socially incorrect in behavior

"resentment flared at such an unmannered intrusion"

2. ill-bred, bounderish, lowbred, rude, underbred, yokelish

of persons) lacking in refinement or grace

3. uncivil, rude

lacking civility or good manners

"want nothing from you but to get away from your uncivil tongue"- Willa Cather

4. natural, raw, rude

used especially of commodities) being unprocessed or manufactured using only simple or minimal processes

"natural yogurt"

"natural produce"

"raw wool"

"raw sugar"

"bales of rude cotton"

5. crude, primitive, rude

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"

"primitive living conditions in the Appalachian mountains"

Source: WordNet® (An amazing lexical database of English)

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