Tristitia
Tristitia  est dolor qui concipitur animo propter incommodum quoddam, damnum, desperationem, maerorem, inopiam, frustrationem. Qui tristitiam experitur quietus vel lethargicus fieri potest atque ab aliis recedere. Indicio tristitiae extremae est depressio, animi habitus qui morbo depressivo maiore aut morbo depressivo pertinace effici potest. Fletus et lacrimae indicia tristitiae esse possunt.

Tristitia est unus ex "sex animi motuum fundamentalium" a Paulo Ekman descriptis, cum felicitate, ira, miratione, timore, et taedio.

Neuroanatomia

Tristitia coniungi inventa est cum "incrementis agitationis bilateralis intra regiones corticis temporalis medii et posterioris, cerebelli lateralis, vermis cerebelli, cerebri medii, putaminis, et caudati."

Positronibus emissis tomographia monstravit tristitiam in quattuor viris mulieribusque tribus normativis stimulari posse cum ei de rebus tristibus cogitent: activitas cerebri in cortice bilaterali praefrontali inferiori (gyrus frontalis inferior cum areis 44, 45, 47) et orbitofrontali (areae 10, 11) crevit. In investigatione quae tristitiam in homines pelliculis monstratis adduxit, hic sensus cum incrementis significantibus in regionali cerebri agitatione, praecipue in cortice praefrontali, in thalamo et regione area 9 Brodmanniana appellata, coniunctus est. Significans agitationis incrementum etiam observatum est in structuris temporalibus anterioribus bilateralibus.

In litteris
Edmundus Spenser aetate renascentiae in The Faerie Queene tristitiam dixit esse indicium pignoris spiritualis.

Iulia Kristeva, philosopha Bulgarico-Francica, putabat "diversificationem animi habituum, tristitiá varietatem, dolore mentis vel luctú urbanitatem esse impressionem humanitatis quae profecto victrix non est, sed subtilis, ad pugnam parata, creativa."

Depressio clinica
Depressio (psychiatria)
Dysthymia
Joie de vivre
Lamentationes
Melancholia
Misericordia
Modus (psychologia)
Pessimismus
Solitudo
Taedium vitae
Tristia (Ovidius)

Notae

Bibliographia
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Animi motus