на выдержку; на авось (...there was a small slot for coins and a selector for the juke box near the entrance. I put in two dimes and jabbed the selector at random. (I. Shaw)); как попало; наугад; наобум (without any particular plan or system • The police were stopping cars at random and checking their brakes; Choose a number at random); вслепую; наудачу; произвольно; как Бог на душу положит (Anglophile); выборочно (Irina Verbitskaya); от балды (Anglophile); без разбора (denghu); вкривь и вкось; на разбив; наобум Лазаря; эпизодически (Post Scriptum); без разбору (MichaelBurov); вкривь; сумбурно (Some negative thoughts emerge at random because the mind isn't occupied and has extra attention to wander around. Abysslooker)

в общем порядке (randomly assigned seat sankozh)

або-как (xmoffx); как придётся (They were sorted at random, with names being drawn from a hat. Abysslooker)

at random

: 114 phrases in 21 subjects

Automobiles	2
Clinical trial	7
Construction	3
Diplomacy	2
Economics	1
Figurative	3
General	36
Idiomatic	1
Informal	12
Law	1
Makarov	18
Mathematics	11
Military	1
Neural networks	1
Quality control and standards	2
Scientific	3
Social media	3
Statistics	1
Technology	2
Telecommunications	1
Transport	3