infrequent

As a noun repetition

is repetition.

As an adjective infrequent is

infrequent.

As a verb intermitted

is (intermit).

As an adjective infrequent is

infrequent.

As adjectives the difference between infrequent and undefined

is that infrequent is infrequent while undefined is lacking a definition or value.

As adjectives the difference between common and infrequent

is that common is mutual; shared by more than one while infrequent is infrequent.

As a noun common

is mutual good, shared by more than one.

As a verb common

is (obsolete) to communicate (something).

As adjectives the difference between magnanimous and infrequent

is that magnanimous is noble and generous in spirit while infrequent is infrequent.

As adjectives the difference between infrequent and singular

is that infrequent is not frequent; not happening frequently while singular is being only one of a larger population.

As a noun singular is

a form of a word that refers to only one person or thing.

As an adjective infrequent

is infrequent.

As an adverb irregularly is

in an irregular manner; without rule, method, or order.

As adjectives the difference between unusual and infrequent

is that unusual is unlike what is expected; differing in some way from the norm while infrequent is not frequent; not happening frequently.

Scarce is a related term of infrequent.

As adjectives the difference between scarce and infrequent

is that scarce is uncommon, rare; difficult to find; insufficient to meet a demand while infrequent is infrequent.

As an adverb scarce

is scarcely, only just.