rogue

Concise Oxford English Dictionary © 2008 Oxford University Press:
rogue/rəʊɡ/

▶noun

• 1 a dishonest or unprincipled man.

  ■ a mischievous but likeable person.

• 2 [usu. as modifier] an elephant or other large wild animal with destructive tendencies driven away or living apart from the herd: a rogue elephant.

  ■ a person or thing that is defective, aberrant, or unpredictable.

  ■ a seedling or plant deviating from the standard variety.

▶verb remove rogue plants or seedlings from (a crop).

– derivatives
roguery noun (pl. rogueries).

– origin C16 (denoting an idle vagrant): prob. from L. rogare ‘beg, ask’, and rel. to obs. sl. roger ‘vagrant beggar’.