childish

As an adjective childish is

of or suitable for a child.

Childish is a related term of simple.

As adjectives the difference between childish and simple

is that childish is of or suitable for a child while simple is uncomplicated; taken by itself, with nothing added.

As a noun simple is

(medicine) a preparation made from one plant, as opposed to something made from more than one plant.

As a verb simple is

(transitive|intransitive|archaic) to gather simples, ie, medicinal herbs.

Inane is a synonym of childish.

As adjectives the difference between childish and inane

is that childish is of or suitable for a child while inane is lacking sense or meaning (often to the point of boredom or annoyance).

As a noun inane is

that which is void or empty.

Tender is a related term of childish.

As a noun tender

is (label) (l) (fuel-carrying railroad car).

As an adjective childish is

of or suitable for a child.

As adjectives the difference between childish and whiny

is that childish is of or suitable for a child while whiny is whining; tending to whine or complain.

Childish is a related term of worthless.

As adjectives the difference between childish and worthless

is that childish is of or suitable for a child while worthless is not having worth and use, without value, inconsequential.

Childish is a related term of green.

As adjectives the difference between childish and green

is that childish is of or suitable for a child while green is (politics) of, or pertaining, to a green party.

As a proper noun green is

.

Childish is a related term of trivial.

As adjectives the difference between childish and trivial

is that childish is of or suitable for a child while trivial is ignorable; of little significance or value.

As a noun trivial is

(obsolete) any of the three liberal arts forming the trivium.