frightful vs fearful

frightful and fearful both are adjectives.

Word	Noun	Adjective	Verb	Adverb
frightful	No	Yes	No	No
fearful	No	Yes	No	No

As adjectives, frightful and fearful are synonyms defined as:

frightful (adjective)	fearful (adjective)
provoking horror	lacking courage; ignobly timid and faint-hearted
extremely distressing	experiencing or showing fear
extreme in degree or extent or amount or impact	causing fear or dread or terror
	extremely distressing
	timid by nature or revealing timidity