[2] Born Adam Pavlovčin in Myjava and raised in Senica, Adonxs took an interest in dancing and singing at an early age, inspired by his older sister.

[10] Subsequently, he rediscovered singing and moved to Prague to be classically trained by renowned opera singer Hana Peckova, whom he credits with expanding his bass vocal range up into his pre-teen tenor.

[9] He earned his bachelor's degree in Songwriting and Creative Musicianship at the British and Irish Modern Music Institute in London, United Kingdom, graduating with first class honours.

[11][12] Struggling to pay for tuition and living expenses while pursuing a degree, he took on various jobs, including working as a server at a gay bar, to make ends meet.

[11] In an interview with Cosmopolitan, he said: "Often times I would finish my night shift at the bar at 3 a.m. and start my singing class at 9 a.m."[13] Adonxs, who came out as gay to his parents two weeks after "falling madly in love" with a boy at 18, has described his college years in London as the time of "complete liberation" and "self discovery", with a profound impact on his songwriting, on developing his style and stage persona.

[16] In early 2018, the multicultural formation released their debut EP titled Keeper, an alternative, predominantly baroque pop record that incorporates elements of symphony orchestra,[17][18] while its lyricism speaks of Adonxs as a "man trapped in his desires and visions".

[21][20] Following the pandemic restrictions on live music venues in the United Kingdom, Adonxs moved back to Prague, Czechia to embark on a solo career in 2021.

[13] In 2021, Adonxs rose to prominence in his native country and Czechia after winning SuperStar, the seventh season of the joint Czech-Slovak version of Idols.

[22][23] He is the first openly queer winner of the joint singing competition and has described his victory as a "huge step forward" for the Czech and Slovak society.

"[11][21] Following the win, he signed with Warner and began writing and recording his debut album at Lavagance Studios with producers Oliver Fillner, Marek Rakovicky and Tom Lobb.

[29] Adonxs came up with the concept of his alter ego during his studies in London to liberate himself on stage and overcome his then "tremendous" fear of performing in front of audience.

[32] In the music video for "Moving On", Adonxs is wearing a custom skintight garment adorned with hand-sewn crystals by Preciosa, a look he previously teased on Let's Dance.

[36] On 11 June, as the only Slovak artist in the lineup, Adonxs played at Lovestream Festival headlined by Dua Lipa,[37] where he premiered his upcoming singles "Game" and "Cold Summer".

[56] In December 2024, Czech Television announced that it had internally selected Adonxs to represent Czechia in the Eurovision Song Contest 2025, which will be held in Basel, Switzerland.

[7] He was a member of the RDS Company, performed with the likes of Robbie Williams, Nicole Scherzinger or Leona Lewis, and trained with renowned choreographers including Keone Madrid, Camillo Lauricella and Ian Eastwood.

[24] In addition to the campaign, Adonxs has called for an official change of the definition of the word "love" (láska) in the Slovak dictionary, to make it inclusive of all sexual and gender identities.

[85] On 14 October, Adonxs performed at a protest march in memory of two queer victims of the 2022 terrorist attack outside an LGBT bar in Bratislava, Slovakia, carried out by a "radicalized" teenager with anti-LGBT and antisemitic beliefs.

[90] Adonxs is a natural basso profondo, the deepest bass, while possessing a vocal range that extends up into tenor, which gives him a distinctive timbre in the upper register.

[3][94] Adonxs grew up listening to Queen, Depeche Mode, Elton John, Seal, Prince,[15] and has cited AURORA, Sevdaliza, Josef Salvat, Sufjan Stevens, London Grammar, Lorde, Dua Lipa, Birdy, Florence + the Machine as some of his musical influences, while mentioning Woodkid as the key inspiration in his career beginnings.