Antonyms of adj unjustified

1 sense of unjustified

Sense 1
undue, unjustified, unwarranted -- (lacking justification or authorization; "desire for undue private profit"; "unwarranted limitations of personal freedom")

INDIRECT (VIA unreasonable) -> reasonable, sensible -- (showing reason or sound judgment; "a sensible choice"; "a sensible person")

Similarity of adj unjustified

1 sense of unjustified

Sense 1
undue, unjustified, unwarranted -- (lacking justification or authorization; "desire for undue private profit"; "unwarranted limitations of personal freedom")
       => unreasonable (vs. reasonable) -- (not reasonable; not showing good judgment)