Go away or leave:
— He absented himself.

synonym: remove.

Dutch: vertrekken, verwijderen

Not being in a specified place.

Roget 452: vacant, unintellectual, unideal^†, unoccupied, unthinking, inconsiderate, thoughtless, mindless, no-brain, vacuous; absent etc. (inattentive) 458; diverted; irrational etc. 499; narrow-minded etc. 481.    unthought of, undreamt 'of, unconsidered; off one's mind; incogitable^†, not to be thought of.    ... show more

Polish: nieobecny

Nonexistent:
— The thumb is absent.

synonyms: lacking, missing, wanting.

Roget 187: absent, not present, away, nonresident, gone, from home; missing; lost; wanting; omitted; nowhere to be found; inexistence etc. 2^†.    empty, void; vacant, vacuous; untenanted, unoccupied, uninhabited; tenantless; barren, sterile; desert, deserted; devoid; uninhabitable.    ... show more

Roget 2: inexistent^†, nonexistent etc. 1; negative, blank; missing, omitted; absent etc. 187; insubstantial, shadowy, spectral, visionary.    unreal, potential, virtual; baseless, in nubibus [Lat.]; unsubstantial etc. 4; vain.    unborn, uncreated^†, unbegotten, unconceived, unproduced, unmade.    perished, annihilated, etc. v.; extinct, exhausted, gone, lost, vanished, departed, gone with the wind; defunct etc. (dead) 360.    fabulous, ideal etc. (imaginary) 515, supposititious etc. 514.    ... show more

Lost in thought; showing preoccupation:
— An absent stare.
— An absentminded professor.

synonyms: absentminded, abstracted, scatty.

Roget 458: inattentive; unobservant, unmindful, heedless, unthinking, unheeding, undiscerning^†; inadvertent; mindless, regardless, respectless^†, listless etc. (indifferent) 866; blind, deaf; bird-witted; hand over head; cursory, percursory^†; giddy-brained, scatter-brained, hare-brained; unreflective, unreflecting^†, ecervele [Fr.]; offhand; dizzy, muzzy^†, brainsick^†; giddy, giddy as a goose; wild, harum-scarum, rantipole^†, highflying; heedless, careless etc. (neglectful) 460.    inconsiderate, thoughtless.    absent, abstracted, distrait; absentminded, lost; lost in thought, wrapped in thought; rapt, in the clouds, bemused; dreaming on other things, musing on other things; preoccupied, engrossed etc. (attentive) 457; daydreaming, in a reverie etc. n.; off one's guard etc. (inexpectant) 508^†; napping; dreamy; caught napping.    disconcerted, distracted, put out etc. v.. ... show more