casual adj.
VERBS appear, be, sound | become
ADV. extremely, very | almost She sounded almost casual. | fairly, quite, rather | apparently, seemingly | carefully, elaborately, studiedly There was something a little too carefully casual in his tone. | deceptively
PREP. about He was very casual about it all.
You can also check other dicts: casual (English, 中文解释 ), wordnet sense, Collins Definition