festive

As a noun feast

is a very large meal, often of a ceremonial nature.

As a verb feast

is to partake in a feast, or large meal.

As an adjective festive is

having the atmosphere, decoration, or attitude of a festival, holiday, or celebration.

As adjectives the difference between festive and gloomy

is that festive is having the atmosphere, decoration, or attitude of a festival, holiday, or celebration while gloomy is imperfectly illuminated; dismal through obscurity or darkness; dusky; dim; clouded.

Festive is a synonym of frolicsome.

As adjectives the difference between festive and frolicsome

is that festive is having the atmosphere, decoration, or attitude of a festival, holiday, or celebration while frolicsome is given to frolicking; playful.

Mirthful is a related term of festive.

As adjectives the difference between mirthful and festive

is that mirthful is filled with mirth while festive is having the atmosphere, decoration, or attitude of a festival, holiday, or celebration.

As a noun merriment

is a state of enjoyable exuberance.

As an adjective festive is

having the atmosphere, decoration, or attitude of a festival, holiday, or celebration.

Festive is a synonym of sportive.

As adjectives the difference between festive and sportive

is that festive is having the atmosphere, decoration, or attitude of a festival, holiday, or celebration while sportive is gay; frolicsome; merry.

As a noun sportive is

(cycling) cyclosportive.

As adjectives the difference between festive and frolic

is that festive is having the atmosphere, decoration, or attitude of a festival, holiday, or celebration while frolic is merry, joyous; later especially, frolicsome, sportive, full of playful mischief.

As a noun frolic is

gaiety; merriment.

As a verb frolic is

to romp; to behave playfully and uninhibitedly.

As adjectives the difference between glad and festive

is that glad is pleased, happy, gratified while festive is having the atmosphere, decoration, or attitude of a festival, holiday, or celebration.

As a verb glad

is to make glad; to cheer; to gladden; to exhilarate.

Convival is a related term of festive.

As adjectives the difference between convival and festive

is that convival is (obsolete) relating to a feast or festivity; convivial while festive is having the atmosphere, decoration, or attitude of a festival, holiday, or celebration.

Friendly is a related term of festive.

As adjectives the difference between friendly and festive

is that friendly is generally warm, approachable and easy to relate with in character while festive is having the atmosphere, decoration, or attitude of a festival, holiday, or celebration.

As an adverb friendly

is in a friendly manner, like a friend.

As a noun friendly

is (sports) a game which is of no consequence in terms of ranking, betting etc.