" rivalrous "

1: having or marked by a strong desire to win or be better than others;

  * e.g., " ... The two siblings shared a rivalrous but ultimately loving relationship. "

•  Synonyms : 

•  competing,

•  competitive,

•  rival,

•  determined,

•  diligent,

•  driving,

•  dynamic,

•  enterprising,

•  gung ho,

•  hungry,

•  hustling,

•  industrious,

•  motivated,

•  scrappy,

•  venturesome,

•  venturous,

•  animated,

•  lively,

•  spirited,

•  ardent,

•  avid,

•  eager,

•  energetic,

•  impassioned,

•  keen,

•  raring,

•  vigorous,

•  aggressive,

•  assertive,

•  high-flying,

•  opportunistic,

•  overambitious,

•  pretentious,

•  pushy,

•  self-assertive,

•  ambitious,

•  aspiring,

•  go-getting,

•  hard-driving,

•  pushing,

•  self-seeking

•  Antonyms : 

•  apathetic,

•  disinterested,

•  indifferent,

•  uneager,

•  unenthusiastic,

•  unexcited,

•  uninterested,

•  casual,

•  easygoing,

•  lackadaisical,

•  lazyish,

•  halfhearted,

•  lukewarm,

•  tepid,

•  lazy,

•  lethargic,

•  listless,

•  shiftless,

•  sluggish,

•  spiritless,

•  unaggressive,

•  unassertive,

•  ambitionless,

•  unambitious