Adjective
1. associated by chance and not an integral part;
"poetry is something to which words are the accidental, not by any means the essential form"- Frederick W. Robertson"they had to decide whether his misconduct was adventitious or the result of a flaw in his character"2. occurring or appearing or singled out by chance;
"their accidental meeting led to a renewal of their friendship""seek help from casual passers-by""a casual meeting""a chance occurrence"3. without intention (especially resulting from heedless action);
"with an inadvertent gesture she swept the vase off the table""accidental poisoning""an accidental shooting"