Underhand is a related term of bogus.

As adjectives the difference between underhand and bogus

is that underhand is secret; clandestine while bogus is counterfeit or fake; not genuine.

As an adverb underhand

is with an underhand movement.

As a noun bogus is

(us|dialect) a liquor made of rum and molasses.

Ingratiating is a related term of irresistible.

As adjectives the difference between ingratiating and irresistible

is that ingratiating is which ingratiates; which attempts to bring oneself into the favour of another the implication is often of flattery or insincerity while irresistible is irresistible (not able to be resisted).

As a verb ingratiating

is .

As nouns the difference between profundity and clearheadedness

is that profundity is the state of being profound or abstruse while clearheadedness is the quality of being clearheaded.

Affirmation is a related term of acknowledgement.

As nouns the difference between affirmation and acknowledgement

is that affirmation is that which is affirmed; a declaration that something is true while acknowledgement is (british) the act of acknowledging; admission; avowal; owning; confession.

As adjectives the difference between unusual and unnatural

is that unusual is unlike what is expected; differing in some way from the norm while unnatural is not natural; supernatural or artificial.

Perfunctory is a synonym of lax.

As an adjective perfunctory

is done merely to discharge a duty; performed mechanically and as a thing of rote; done in a careless and superficial manner; characterized by indifference; as, perfunctory admonitions; aspiring only to minimum standards.

In lang=en terms the difference between extension and adjunct

is that extension is the set of tuples of values that, used as arguments, satisfy the predicate while adjunct is a key or scale closely related to another as principal; a relative or attendant key.

As nouns the difference between extension and adjunct

is that extension is the act of extending or the state of being extended; a stretching out; enlargement in breadth or continuation of length; increase; augmentation; expansion while adjunct is an appendage; something attached to something else in a subordinate capacity.

As an adjective adjunct is

connected in a subordinate function.

Inroad is a related term of penetration.

As nouns the difference between inroad and penetration

is that inroad is an advance into enemy territory, an incursion, an attempted invasion while penetration is penetration.

As a verb inroad

is (obsolete|transitive) to make an inroad into; to invade.

Impediment is a related term of fence.

As nouns the difference between impediment and fence

is that impediment is a hindrance; that which impedes or hinders progress while fence is a thin, human-constructed barrier which separates two pieces of land or a house perimeter.

As a verb fence is

(lb) to enclose, contain or separate by building fence.

Story is a related term of hearsay.

As nouns the difference between story and hearsay

is that story is a sequence of real or fictional events; or, an account of such a sequence while hearsay is information that was heard by one person about another.

As a verb story

is to tell as a story; to relate or narrate about.