Capable of exceptionally subtle or acute perception, feeling, appreciation, etc.; highly sensitive to nuance or subtlety.

Of a sense, physical faculty, measuring instrument, etc.: capable of delicate perception or discrimination; sensitive.

†(a) having a fine mind, clever; subtle or ingenious in argument; given to making fine distinctions (obsolete); (b) having an attractive…

Of the eye, ear, etc.: able to distinguish or discriminate to a high degree; sensitive, acute.

That refines (in various senses); spec. (formerly) subtle or oversubtle in thought or language; (now usually) that makes a person or thing more…

Of persons: Careful or nice in choosing, selective, discriminative. Obsolete or dialect.

Of thought, etc.: raised to a high degree of subtlety, refinement, or precision. Now merged with or understood as sense A. 1c.

Perfectly correct or precise, esp. in matters of dress or appearance; scrupulous, neat, fastidious.

Of the power of feeling, bodily or mental, the senses, etc.: Keenly sensitive to impressions; acutely susceptible of pain, pleasure, etc…

Full of feeling; characterized by strong emotion, sensitivity, or sympathy.