Webster's English Dictionary

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rude

rude \'ru:d\ aj [ME, fr. MF, fr. L rudis; akin to L rudus rubble, ruere to 
   fa]ll - more at RUG 1a: being in a rough or unfinished state : CRUDE  1b: 
   NATURAL, RAW  1c: PRIMITIVE, UNDEVELOPED  1d: SIMPLE, ELEMENTAL  2: lacking 
   refinement or delicacy :  2a: IGNORANT, UNLEARNED  2b: INELEGANT, UNCOUTH  
   2c: offensive in manner or action : DISCOURTEOUS  2d: UNCIVILIZED, SAVAGE  
   2e: COARSE, VULGAR  3: marked by lack of training or skill : INEXPERIENCED  
   4: ROBUST, STURDY  5: FORCEFUL, ABRUPT EEN mean lacking in social 
   refinement. RUDE implies ignorance of or indifference to good form; it may 
   suggest intentional discourtesy; CRUDE may apply to thought or behavior 
   limited to the gross, the obvious, or the primitive and ignorant of 
   civilized amenities; RAW suggests being untested, inexperienced, or 
   unfinished; CALLOW suggests the immaturity of adolescence or early manhood; 
   GREEN implies nothing worse than simple unfamiliarity with a new 
   environment or pursuit - rude.ly av SYN syn RUDE, ROUGH, CRUDE, RAW, 
   CALLOW, GR