experimental Antonyms
abstractive
nonobjective
half-assed
older than dirt
older than the hills
unproven
quantifiable
generally accepted
non-working
as old as Adam
as old as the sea
as old as time
extremely old
not updated
nonfigurative
tried
transcendentalist
accede
answer
a priori
jejune
legacy
metaphysical
noetic
old
proven
speculative
tested
theoretic
theoretical
non-practical