obtuse

As adjectives the difference between obtuse and ludicrous

is that obtuse is blunt; not sharp while ludicrous is idiotic or unthinkable, often to the point of being funny.

As adjectives the difference between naive and obtuse

is that naive is while obtuse is blunt; not sharp.

As an adjective obtuse

is blunt; not sharp.

As a noun abuse is

improper treatment or usage; application to a wrong or bad purpose; an unjust, corrupt or wrongful practice or custom.

As a verb abuse is

to put to a wrong use; to misapply; to use improperly; to misuse; to use for a wrong purpose or end; to pervert; as, to abuse one's authority.

As adjectives the difference between obtuse and improvident

is that obtuse is blunt; not sharp while improvident is failing to provide for the future; reckless.

As adjectives the difference between obese and obtuse

is that obese is extremely overweight, especially: weighing more than 20% (for men) or 25% (for women) over their ideal weight determined by height and build; or, having a body mass index over 30 kg/m2 while obtuse is blunt; not sharp.

As adjectives the difference between obtuse and zero

is that obtuse is blunt; not sharp while zero is none.

As a numeral zero is

the cardinal number occurring before one and that denotes no quantity or amount at all, represented in Arabic numerals as 0.

As a noun zero is

the numeric symbol that represents the cardinal number zero.

As a verb zero is

to set a measuring instrument to zero; to calibrate instrument scale to valid zero.

As adjectives the difference between obtuse and ignorant

is that obtuse is blunt; not sharp while ignorant is unknowledgeable or uneducated; characterized by ignorance.

As adjectives the difference between oblong and obtuse

is that oblong is longer than wide while obtuse is blunt; not sharp.

As a noun oblong

is something with an oblong shape.

As adjectives the difference between obtuse and arcane

is that obtuse is blunt; not sharp while arcane is understood by only a few; obscure; requiring secret or mysterious knowledge.

As an adjective obtuse

is blunt; not sharp.

As a noun folly is

foolishness.