casual
ca-su-al
adjective
Happening by chance; not planned or deliberate; temporary or irregular.
"They had a casual encounter at the market."
adjective
Relaxed and unconcerned; not formal or serious in manner, dress, or approach.
"He preferred casual clothes for the weekend."
Thesaurus
Synonyms: free-and-easy, informal, light, fooling, unplanned, chance, irregular, occasional, passing, cursory, careless, superficial