incompetent

As an adjective incompetent

is unskilled, lacking normally expected degree of ability.

As a noun incompetent

is a person who is incompetent.

As an initialism PHB is

pointy-haired boss, an incompetent micromanager.

As an adjective incompetent

is incompetent.

As a noun intestableness is

(legal) the state or characteristic of being legally disqualified from making a will, as by reason of being under the age of majority or mentally incompetent.

As nouns the difference between incompetent and intestability

is that incompetent is a person who is incompetent while intestability is the state or characteristic of being legally disqualified from making a will, as by reason of being under the age of majority or mentally incompetent.

As an adjective incompetent

is unskilled, lacking normally expected degree of ability.

As adjectives the difference between incompetent and intestable

is that incompetent is incompetent while intestable is (legal) not legally permitted to make a will, as by reason of being under the age of majority or mentally incompetent.