preposterous

As a letter s

is the letter s with a.

As an adjective preposterous is

absurd, or contrary to common sense.

As an adjective preposterous

is absurd, or contrary to common sense.

As a noun null is

zero, nil; the cardinal number before einn.

As adjectives the difference between preposterous and perpendicular

is that preposterous is absurd, or contrary to common sense while perpendicular is (architecture) of a style of english gothic architecture from the fourteenth and fifteenth centuries.

As adjectives the difference between precipitous and preposterous

is that precipitous is steep, like a precipice; as, a precipitous cliff or mountain while preposterous is absurd, or contrary to common sense.

As adjectives the difference between preposterous and undefined

is that preposterous is absurd, or contrary to common sense while undefined is lacking a definition or value.

As adjectives the difference between preposterous and unethical

is that preposterous is absurd, or contrary to common sense while unethical is not morally approvable; morally bad; not ethical.

As adjectives the difference between antic and preposterous

is that antic is ancient while preposterous is absurd, or contrary to common sense.

As adjectives the difference between preposterous and frivolous

is that preposterous is absurd, or contrary to common sense while frivolous is silly, especially at an inappropriate time or in an inappropriate manner.

Dubious is a related term of preposterous.

As adjectives the difference between dubious and preposterous

is that dubious is arousing doubt; questionable; open to suspicion while preposterous is absurd, or contrary to common sense.

As adjectives the difference between preposterous and pretentious

is that preposterous is absurd, or contrary to common sense while pretentious is marked by an unwarranted claim to importance or distinction.