Casual
Part of speech: noun
Definition: A worker who is only working for a company occasionally, not as its permanent employee.
Part of speech: adjective
Definition: Happening by chance. Coming without regularity; occasional or incidental. Employed irregularly Careless. Happening or coming to pass without design. Informal, relaxed. Designed for informal use.
Example sentence: A human being becomes human not through the casual convergence of certain biological conditions, but through an act of will and love on the part of other people.
Careless
Part of speech: adjective
Definition: Free from care; unworried, without anxiety.Not concerned or worried (about).Not giving sufficient attention or thought, especially concerning the avoidance of harm or mistakes.
Example sentence: There is no fool like a careless gambler who starts taking victory for granted.