geason
uncommon
rare
ultrarare
rare as rocking horse shit
seldomness
remarkable
few and far between
rare as hen's teeth
rareness
sporadic
unique
rarer than hens' teeth
sporadicalness
antrin
rareish
semirare
rare as a four-leaf clover
superrare
uncommonly
extraordinary
offbeat
ultrararefied
rocking horse shit
different
one in a million
out of the way
not grow on trees
attenuate
unusualness
nonrare
seldom
rarefiable
uncommonness
unoften
scarce
historically
way-out
once in a blue moon
selly
rarely
peculiar
strange
atypical
unfrequent
dead donkey
fremd
seldomly
unusual
exceptional
rarefactional
supersubtle
raresome
sporadical
sporadically
unusuality
not uncommon
periodically
estival
singularity
aestival
unwonted
unaccustomed
rarity
unwontedly
out of the common
unmiraculous
episodic
episodicity
rara avis
freakish
infrequent
one-shot
foggiest
limited
distinguishing characteristic
peculiarity
distinctive feature
inimicable
out of the ordinary
out-of-the-way
shenanigans
unregular
exotic
thin on the ground
rare bird
common as pig tracks
garden variety
unexotic
weird
scantly
untypical