The difference between Indifferent and Zealous

When used as adjectives, indifferent means not caring or concerned, whereas zealous means full of zeal.

Indifferent is also noun with the meaning: a person who is indifferent or apathetic.

Indifferent is also adverb with the meaning: to some extent, in some degree (intermediate between very and not at all).

check bellow for the other definitions of Indifferent and Zealous

Indifferent as an adjective:

Not caring or concerned; uninterested, apathetic.

Examples:

"He was indifferent to the proposal, since it didn’t affect him, either way."
Indifferent as an adjective:

Indicating or reflecting a lack of concern or care.

Examples:

"She responded with an indifferent shrug."
Indifferent as an adjective:

Mediocre (usually used negatively in modern usage).

Examples:

"The long distance and the indifferent roads made the journey impossible."

"The performance of Blue Jays has been indifferent this season."
Indifferent as an adjective:

Having no preference or bias, being impartial.

Examples:

"I am indifferent between the two plans."
Indifferent as an adjective:

Not making a difference; without significance or importance.

Examples:

"Even if one appliance consumes an indifferent amount of energy when left on stand-by overnight, together they can represent 10% of the electricity demand of a household."
Indifferent as an adjective (mechanics):

Being in the state of neutral equilibrium.
Indifferent as an adjective (obsolete):

Not different, matching.

Indifferent as an adverb (obsolete):

To some extent, in some degree (intermediate between very and not at all); moderately, tolerably, fairly.

Examples:

"The face of the Moon appearing to me to be full of indifferent high mountains..."

Zealous as an adjective:

Full of zeal; ardent, fervent; exhibiting enthusiasm or strong passion.