untroubled
词形变化：
同义词：
peaceful | serene | undisturbed | tranquil | placid | collected | content | calm | still | unruffled | unworried | secure | unafraid |
反义词：
troubled |
词义辨析：
同义参见:
placid
content1
peaceful
collected
undisturbed
tranquil
still1
serene
反义:
a.没有忧虑的; 平静的
troubled