無邪気|むじゃきmujaki[1]atamadaka (head-high)

1. na-adjective, nouninnocent; simple-minded
   彼女かのじょは無邪気むじゃきを装よそおった。↗

   She put on an air of innocence.

• SynonymナイーブNeutralLoanword for naive and innocent, but also often for emotionally sensitive; 無邪気 stresses childlike innocence free of malice.
• Synonym純情じゅんじょうNeutralA pure heart, often said of romance; 無邪気 stresses childlike innocence.
• Synonym純真じゅんしんNeutralPure and unspoiled, with a laudatory tone; 無邪気 focuses on the lack of malice.
• Synonym初々しいういういしいNeutralFresh and unsullied, like someone young and inexperienced; 無邪気 stresses childlike innocence.
• Synonym純朴じゅんぼくNeutralHonest and unsophisticated, often said of country people; 無邪気 stresses childlike innocence.
• Synonym無心むしんNeutralAbsorbed and free of distracting thoughts, as in 「無心に遊ぶ」; 無邪気 stresses innocence without malice.
• Synonym純じゅんWrittenWritten word for pure, used as a na-adjective in 「純な心」 and as a prefix; 無邪気 is more colloquial.
• SynonymイノセントNeutralLoanword for innocent, above all guiltless; often seen in titles of works. 無邪気 is the more everyday word.
• Synonym天真爛漫てんしんらんまんWrittenA four-character idiom for artless, spontaneous innocence; written in flavor and stronger than 無邪気.
• Related単純たんじゅんNeutralSimple or simple-minded, and can carry a critical nuance; 無邪気 stresses innocence without malice.
• RelatedたわいないNeutralChildish and silly, but also innocent, as in 「たわいない話」; 無邪気 focuses on the absence of malice.
• Related罪の無いつみのないNeutralHarmless and free of malice, as in 「罪のない嘘」; 無邪気 stresses childlike innocence.
• Related純潔じゅんけつWrittenWritten-style word for chastity, being unstained; 無邪気 stresses childlike innocence.
• Related天真てんしんWrittenWritten word for natural, inborn naivete; 無邪気 is the more colloquial choice.
• Antonym邪悪じゃあくNeutralDirect antonym on the good–evil axis: wicked and evil, where 無邪気 is innocent.
• Antonym狡猾こうかつNeutralAntonym on the innocence–cunning axis: sly and calculating, the opposite of 無邪気.

Use 「無邪気」 for childlike innocence with no malice, as in 「無邪気な笑顔」. 「天真爛漫」 is a stronger, written idiom for artless openness; 「純真」「純朴」 for pure, honest character; 「純情」 for innocence in love. For contrast, 「邪悪」 opposes it on good vs. evil and 「狡猾」 on innocence vs. cunning.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 悪気わるぎのなく、素直すなおな様子ようす。