1) General subject: time dependent, unsettled, unsteady
2) Military: (о потоке) unsteady
3) Engineering: irregular
4) Mathematics: nonstationary, nonsteady
5) Accounting: time-varying
6) Electronics: nonsteady nonstationary
7) Information technology: time-dependent (о режиме работы), transient
8) Oil: time-dependent
9) Business: transitional
10) Drilling: non-stationary, unstable
11) Sakhalin energy glossary: non-steady
12) Quality control: unsteady-state
13) Makarov: evolutional, evolutionary, immature (о признаке), instable, undecided (о погоде), unsteady (напр. о течении, режиме), unsteady (о состоянии, процессе)
14) Combustion gas turbines: non-uniform
Универсальный русско-английский словарь. Академик.ру. 2011.