おでこ（おでこ、odeko）
- forehead

The Japanese word おでこ refers to the forehead. It's the area of the face above the eyebrows and below the hairline. It's a common and everyday word.

⚫︎ おでこに汗（あせ）がたくさん出（で）てきた。 Translation: Sweat came out a lot on my forehead. ⚫︎ 赤（あか）ちゃんは、おでこをなでられるのが好（す）き。 Translation: Babies like to be patted on their foreheads.

⚫︎ おでこ is used in casual and formal conversations. ⚫︎ It is generally safe to use in most situations, especially when referring to someone's or your own forehead. ⚫︎ It's important to note the context, but it is a relatively neutral word.

⚫︎ The word is typically written in hiragana as おでこ. ⚫︎ It isn't commonly written in katakana. ⚫︎ There is no kanji for おでこ that is widely used.

There aren't many direct synonyms for "forehead" in Japanese that are as common. However, you could use phrases to describe the area: ⚫︎ 前頭部（ぜんとうぶ）: This is the medical term for the frontal part of the head, which includes the forehead. It is more formal.

There are no direct antonyms for おでこ because it refers to a specific body part.

彼（かれ）のおでこ］が広（ひろ）い。 ・Translation: His forehead is wide. ・Explanation: This sentence describes the physical characteristic of someone's forehead.

疲（つか）れておでこ］にシワが寄（よ）ってきた。 ・Translation: Wrinkles have appeared on my forehead because I'm tired. ・Explanation: This sentence describes the condition of a person's forehead.

The etymology of おでこ isn't definitively known. However, it's considered to be a compound word. The "お" is a polite prefix and "でこ" seems to be derived from the word "出っ張り（でっぱり）" which means protrusion or bulge and refers to the shape of the forehead.