The Collaborative International Dictionary of English v.0.48:

Tenderness \Ten"der*ness\, n.
   The quality or state of being tender (in any sense of the
   adjective).
   [1913 Webster]

   Syn: Benignity; humanity; sensibility; benevolence; kindness;
        pity; clemency; mildness; mercy.
        [1913 Webster]

WordNet (r) 3.0 (2006):

tenderness
    n 1: a tendency to express warm and affectionate feeling
    2: a pain that is felt (as when the area is touched); "the best
       results are generally obtained by inserting the needle into
       the point of maximum tenderness"; "after taking a cold,
       rawness of the larynx and trachea come on" [syn:
       tenderness, soreness, rawness]
    3: warm compassionate feelings [syn: tenderness,
       tenderheartedness]
    4: a positive feeling of liking; "he had trouble expressing the
       affection he felt"; "the child won everyone's heart"; "the
       warmness of his welcome made us feel right at home" [syn:
       affection, affectionateness, fondness, tenderness,
       heart, warmness, warmheartedness, philia]
    5: a feeling of concern for the welfare of someone (especially
       someone defenseless) [syn: softheartedness, tenderness]

Moby Thesaurus II by Grady Ward, 1.0:

132 Moby Thesaurus words for "tenderness":
   acceptance, airiness, algesia, allergy, anaphylaxis, ascent,
   bleeding heart, bloom, bowels of compassion, bubbliness, budtime,
   buoyancy, clemency, clementness, compassion, compassionateness,
   considerateness, daintiness, delicacy, downiness, early years,
   easiness, easygoingness, empathy, ethereality, exquisiteness,
   featheriness, festering, fineness, floatability, florescence,
   flossiness, flowering time, fluffiness, foaminess, fondness,
   forbearance, forbearing, frothiness, gentleness, gossameriness,
   humaneness, humanity, hyperesthesia, hyperpathia, hypersensitivity,
   identification, inflammation, insolidity, irritability, irritation,
   jeunesse, juvenescence, juvenility, lack of weight, laxness,
   lenience, leniency, lenientness, lenity, levitation, levity,
   lightness, mellowness, mercifulness, mercy, mildness, moderateness,
   morbidezza, my burning youth, my green age, nervousness,
   nonresistiveness, nonrigidity, oversensibility, oversensitiveness,
   overtenderness, passibility, patience, perceptiveness,
   perceptivity, photophobia, pity, plushiness, prickliness,
   prime of life, pulpiness, rankling, responsiveness, ruthfulness,
   salad days, satininess, seedtime of life, sensitiveness,
   sensitivity, sensitization, silkiness, softheartedness, softness,
   sore, sore spot, soreness, sponginess, springtime of life,
   supersensitivity, sympathy, tact, tactfulness, tender age,
   tender feeling, tenderheartedness, tetchiness, thin skin,
   ticklishness, tolerance, touchiness, unheaviness, unsolidity,
   velvetiness, volatility, warm heart, warmheartedness, weakness,
   weightlessness, yeastiness, young blood, youngness, youth,
   youthfulness, youthhead, youthhood, youthiness