rigorous

Từ điển American Heritage Dictionary 4th

rig·or·ous (rĭgʹər-əs)adj.
1. Characterized by or acting with rigor:
a rigorous program to restore physical fitness.
2. Full of rigors; harsh:
a rigorous climate.
3. Rigidly accurate; precise. See Synonyms at burdensome. rigʹor·ous·ly adv.rigʹor·ous·ness n.

• Từ đồng nghĩa / Synonyms:
  stringent, tight, strict