Search Result for "pensiveness": 
Wordnet 3.0

NOUN (2)

1. persistent morbid meditation on a problem;
[syn: pensiveness, brooding]

2. deep serious thoughtfulness;
[syn: pensiveness, meditativeness, contemplativeness]

The Collaborative International Dictionary of English v.0.48:

Pensiveness \Pen"sive*ness\, n. The state of being pensive; serious thoughtfulness; seriousness. --Hooker. [1913 Webster]
WordNet (r) 3.0 (2006):

pensiveness n 1: persistent morbid meditation on a problem [syn: pensiveness, brooding] 2: deep serious thoughtfulness [syn: pensiveness, meditativeness, contemplativeness]
Moby Thesaurus II by Grady Ward, 1.0:

33 Moby Thesaurus words for "pensiveness": absorption, abstraction, brown study, castle-building, close study, concentration, contemplativeness, daydreaming, deep thought, dreamery, dreamfulness, dreaminess, dreaming, dreamlikeness, engrossment, fantasying, gentle melancholy, melancholia, melancholiness, melancholy, musefulness, musing, pipe-dreaming, preoccupation, profound thought, reflectiveness, reverie, romantic melancholy, speculativeness, study, thoughtfulness, tristfulness, wistfulness