Owing to or showing evidence of sympathy, or affinity; happening through or demonstrating correspondences, whether occult or physiological.

Of, related to, feeling, showing, or characterized by sympathy. / Showing approval of or favor towards an idea or action. / (of a person) Attracting the liking of others.

Alternative form of sympathetic

The quality of being sympathetic.

the vibration of a body, at its natural frequency, in response to that of a neighbouring one having that frequency; resonance

(military) Detonation of a charge by exploding another charge adjacent to it.

(music) Any of a set of auxiliary strings found on certain musical instruments, generally not played directly by the performer but used to provide resonance in response to the main strings.

plural of sympathetic string

Hyperactivity of the sympathetic nervous system

(dated) Invisible ink.