[1] In August 2013, he moved to the United States after landing a rare $20,000 basketball scholarship to Victory Rock Prep in Bradenton, Florida.

[5] As a junior at Victory Rock Prep in 2013–14, Adel averaged 22 points and eight rebounds per game in helping the Blue Devils to a 24–8 record.

[6] In November 2014, Adel signed a National Letter of Intent to play college basketball for the University of Louisville.

[6] Adel considered offers from Connecticut, Florida, Mississippi and Virginia Tech before choosing to sign with the Cardinals.

[6] As a senior at Victory Rock Prep in 2014–15, Adel averaged 19.1 points, 8.2 rebounds and 4.0 assists per game in helping the Blue Devils to a 27–9 record.

However, on 20 November, the day before the team's third game, Adel landed awkwardly in practice and was subsequently ruled out for three to six weeks with an MCL sprain in his left knee.

[12] On 6 February, he had a season-best game with 13 points, 7 rebounds, 4 assists and 2 steals in 34 minutes as a starter in a 79–47 win over Boston College.

[19] Adel made his NBA debut on 19 January 2019 against the Denver Nuggets, scoring three points with two rebounds in five minutes of play in a 124–102 loss.

[23] He scored a season-high 29 points in addition to 11 rebounds, two assists, two steals, and two blocks on 29 November, in a loss to the Raptors 905.

[27] He set an NBL record for most field goal attempts without a make when he shot 0–15 during a game against the Cairns Taipans on 20 February 2021.

[33] On 26 May, he made his debut with a franchise-record 37 points alongside nine rebounds and five assists in a 90–87 loss to the Fraser Valley Bandits.