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There is none.
The word harkening (also hearkening) is the present participle of the verb to harken which means to listen attentively or heed. It is used as a noun and (like listen) it has no past participle adjective form. The closest adjective synonym would be heeded (e.g. heeded warnings).
What else can I help you with?
Is circle an adjective?
No, it is a verb or a noun (to go around, to surround; a round shape). The adjective form is circular.
What part of speech is leisurely?
It is an adjective.It is a an adjective.
What part of speech is heavy?
An adjective
Is dilapidated a noun verb or adjective?
it is an adjective!
Is town an adjective?
No. It is not an adjective. An adjective describes something.
What is the adjective for cautious?
Cautious IS an adjective. An adjective is an action!
Is clumsily an adjective?
No, it is an adverb. The adjective is clumsy.
Is ideal an adjective?
It can be. "Ideal" is an adjective and a noun.
What part of speech is yellow?
adjective
Is awkwardly an adjective?
No, it is not an adjective; it is an adverb. The adjective form is "awkward."
Why is unfitness an adjective?
It is not an adjective. It is a noun based on the adjective unfit.
Is the word crafty an adjective?
Yes, it is an adjective.
