off-the-wall (adjective) irrational: illogical, senseless
Sinonime: advanced, ahead of its time, avant-garde, contemporary, current, cutting-edge, fresh,
futuristic, latest, leading-edge, modernistic, modish,
new, new-fashioned, nontraditional, now, present-day,
revolutionary, state-of-the-art*, stylish, today, twenty-first century, up-to-the-minute
Antonime: logical,
rational,
reasonable,
reflective,
sensible,
sound,
stable