negativity: characterized by habitual skepticism and a disagreeable tendency to deny or oppose or resist suggestions or commands
quality: an essential and distinguishing attribute of something or someone; --Shakespeare
botulinum toxin a: a neurotoxin (trade name Botox) that is used clinically in small quantities to treat strabismus and facial spasms and other neurological disorders characterized by abnormal muscle contractions; is also used by cosmetic surgeons to smooth frown lines temporarily