The difference between Challenging and Easy

When used as nouns, challenging means the act of making a challenge, whereas easy means something that is easy.

When used as adjectives, challenging means difficult, hard to do, whereas easy means comfortable.

Easy is also adverb with the meaning: in a relaxed or casual manner.

check bellow for the other definitions of Challenging and Easy

Easy as an adjective (now, rare, _, except in certain expressions):

Comfortable; at ease.

Examples:

"Now that I know it's taken care of, I can rest easy at night."
Easy as an adjective:

Requiring little skill or effort.

Examples:

"It's often easy to wake up but hard to get up."

"The teacher gave an easy test to her students."
Easy as an adjective:

Causing ease; giving comfort, or freedom from care or labour.

Examples:

"Rich people live in easy circumstances."

"an easy chair"
Easy as an adjective:

Free from constraint, harshness, or formality; unconstrained; smooth.

Examples:

"easy manners; an easy style"
Easy as an adjective (informal, pejorative, of a person):

Consenting readily to sex.

Examples:

"He has a reputation for being easy; they say he slept with half the senior class."
Easy as an adjective:

Not making resistance or showing unwillingness; tractable; yielding; compliant.
Easy as an adjective (finance, dated):

Not straitened as to money matters; opposed to .

Examples:

"The market is easy."

Easy as an adverb:

In a relaxed or casual manner.

Examples:

"After his illness, John decided to [[take it easy take it easy]]."
Easy as an adverb:

In a manner without strictness or harshness.

Examples:

"Jane went easier on him after he broke his arm."
Easy as an adverb:

Used an intensifier for large magnitudes.

Examples:

"This project will cost 15 million dollars, easy."
Easy as an adverb:

Not difficult, not hard.