1. LABILE Meaning - Open to change Chemistry - Constantly undergoing or likely to undergo change. Synonyms - reactive, unbalanced, imbalanced. Antonyms - unreactive, balanced. Usage - An Emotionally labile person. 2. LABORIOUS Meaning - involving hard work, great effort. Synonyms - arduous, hard, difficult, strenuous, tough. Antonyms - easy, light, effort-less, simple. Usage - Spent many laborious hours on this project. 3. LABYRINTH Meaning - something extremely complex or tortuous in structure, arrangement, or ...more»