Definition of "sensitive"

The sensitive faculty most part overrules reason, the soul is carried hoodwinked, and the understanding captive like a beast.

1624, Democritus Junior [pseudonym; Robert Burton], The Anatomy of Melancholy: […], 2nd edition, Oxford, Oxfordshire: Printed by John Lichfield and James Short, for Henry Cripps, partition III, section 1, member 2, subsection i

The engine seemed a little sensitive to wet rails, and in consequence the uphill work was not so good north of Dundee as it had been earlier. But I have noted this same "touchiness" on the part of the "A4s", and other modern British 4-6-2s, so that in this respect No. 2006 proved no exception.

1947 January and February, O. S. Nock, “"The Aberdonian" in Wartime”, in Railway Magazine, page 9

Xeltan: I cannot speak more about this problem; it is too sensitive. Suffice it to say, she has compromised my authority as a diplomat.

2008, BioWare, Mass Effect (Science Fiction), Redwood City: Electronic Arts, PC, scene: Citadel

[I]t is quite certain that many of their fears were unfounded, and centred upon perfectly innocent people - especially those who were what we now call "mediumistic" or "sensitives".

1936, Rollo Ahmed, The Black Art, London: Long, page 72

Swedenborg was one of the leading savants of Europe; it would be absurd to place any of our sensitives on the same intellectual level.

2003, Frederic W.H. Myers, Human Personality and Its Survival of Bodily Death Part 2