Antonyms of adj protean

1 sense of protean

Sense 1
protean -- (taking on different forms; "eyes...of that baffling protean grey which is never twice the same")

INDIRECT (VIA variable) -> invariable -- (not liable to or capable of change; "an invariable temperature"; "an invariable rule"; "his invariable courtesy")

Similarity of adj protean

1 sense of protean

Sense 1
protean -- (taking on different forms; "eyes...of that baffling protean grey which is never twice the same")
       => variable (vs. invariable) -- (liable to or capable of change; "rainfall in the tropics is notoriously variable"; "variable winds"; "variable expenses")