fixed (not able to move; unmovable)
constant, permanent (being somewhere that one usually stays)
fixed (essential to something's existence and without which something cannot do)
frequent, regular (participating in or being somewhere often)
stable, regular, constant (one who has been in a certain relationship with someone for a long time)
constant (lasting uninterrupted for a long time)
constant (unchanged through time or space)
constant, permanent (lasting a long time or limitlessly)
constant, fixed, stable (unchanging in beliefs, opinion, or emotions)
constant, fixed, stable (unchanging in beliefs, opinion, or emotions)
stable, solid (able to be walked on without collapsing)
solid (that can be picked up or held, having a texture, and usually firm)

third-person plural nonvirile past of stać