Daily useful words to express your Positive feeling.

"fun" or "enjoyable". It is often used to describe activities or experiences that are entertaining, pleasant, or amusing.

楽しい/たのしい(い形容詞：けいようし/Adjective）

"happy" or "glad". It is often used to express a positive emotion or feeling of happiness, such as receiving good news or achieving something desired.

嬉しい/うれしい(い形容詞：けいようし/Adjective）

"happiness" or "joy". It is often used to describe a state of contentment and satisfaction with one's life, relationships, and circumstances

幸せ/しあわせ(な形容詞：けいようし/NaAdjective）

"pleasant" or "comfortable". It is often used to describe physical sensations or experiences that feel good or enjoyable, such as a massage or a warm bath.

気持ちいい/きもちいい(い形容詞：けいようし/iAdjective）

"refreshed" or "clear". It is often used to describe a feeling of clarity or rejuvenation, either physically or mentally. 
たくさん　ねたから　すっきりした。To express that you feel sukkiri afeter plenty of sleep.

すっきり(な形容詞：けいようし/NaAdjective）

"nostalgic" or "homesick". It is often used to describe a feeling of longing or sentimentality for a past time, place, or experience.

懐かしい/なつかしい(い形容詞：けいようし/iAdjective）

"the best" or "the highest". It can be used to express admiration, approval, or excitement about something that is considered to be of exceptional quality or excellence.
このほんは　さいこうだ。This book is the best.

最高/さいこう(な形容詞：けいようし/NaAdjective）

"well-being", "vitality", or "energy". It's a commonly used word in Japanese that expresses the concept of having a healthy and positive state of mind and body.
We use genki to say How are you?げんき？

元気/げんき(な形容詞：けいようし/NaAdjective）

"to be moved emotionally" or "to be touched deeply". It's a common phrase used to describe the feeling of being deeply affected by something, such as a movie, a book, or someone who has done something nice for you.

感動する/かんどうする(動詞：どうし/Verb）

"to be healed" or "to feel refreshed". It's used to describe the experience of finding relief or comfort from something that was causing stress or discomfort.Iyasareru is derived from the verb iyasu, which means "to heal

癒される/いやされる(動詞：どうし/Verb）