casually由casual这个词变来,意思是偶然的,随便的,漫不经心的。比如:
She found some old photos in the drawer casually她 偶然在抽屉里翻到了一些老照片

He was dressed casually 他穿着很随意
He casually flicked away some dust from his jacket 他漫不经心的把身上的灰拍掉。
同义词:unconcernedly etc. adj:casual casual worker临时工
accidently由accident(事故)变来,意思是偶然的,意外的,就是没想到就发生了,像事故一样
比如:The rifle was discharged accidently枪走火了。。。

总之,以一个例子来说吧:
She found some old photos in the drawer casually 她偶然在抽屉里翻到了一些老照片
She found some color photos in her son's drawer accidentlyy 她意外的在抽屉里翻到了一些他乖乖儿子藏得色图
手打 分给我吧- -
casually [英] ['kl?] ? [美] [?k?j?l?]

adv.偶然地; 漫不经心地; 随便地; 无意地; 临时地
双语例句:
他们漫不经心地油漆房子度过了周末。
They spent their weekend slopping on paint.
我曾看到他为一幅小小的詹姆士一世微缩肖像漫不经心地叫出更高的价。
I'd once seen him blithely overbid for a tiny James I miniature portrait.