gratuitous

英 [grə'tjuːɪtəs] 美[ɡrə'tuɪtəs]

• adj. 无理由的，无端的；免费的

1. without cause;

"a gratuitous insult"

2. costing nothing;

"complimentary tickets"

3. unnecessary and unwarranted;

"a strikers' tent camp...was burned with needless loss of life"