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"We show that this sexual parasitism trait is ancestral for all deep-sea anglerfishes and appears to have evolved as a synergistic combination of ancestral lability in the genetic basis of the adaptive immune system and body size dimorphism," Brownstein says, noting that female anglerfishes do not reject males as foreign bodies, allowing fusion.

Emotional lability is a common symptom of prion disease.

A play about loss, loneliness and the hope of connection, “Primary Trust,” which runs through July 2 at the Roundabout’s Laura Pels Theater, is also a shrewd and gentle vehicle for Harper’s particular gifts — vulnerability, thoughtfulness, emotional lability.

In his book “Why We Sleep,” the neuroscientist Matthew Walker half-jokes that dreams are a time when everyone on Earth becomes “flagrantly psychotic,” experiencing hallucinations, delusions, disorientation, emotional lability and amnesia.

The boredom, frustration, mortification, warmth, impulsiveness, lability, silliness, bewilderment and capacity to forgive.