| Subject | French | English |
| life.sc. | air instable | unstable air |
| el. | amplificateur potentiellement instable | potentially-unstable amplifier |
| el. | arc instable | unstable arc |
| nat.res. | arrangement instable des couches thermiques | unstable arrangement of temperature layers |
| milk. | arôme instable du lait | unstabilized flavour of milk |
| paraglid. | atmosphère instable | unstable atmosphere |
| hi.energ. | bande instable | instability stop band (d'arrêt) |
| hi.energ. | bande instable | stopband (d'arrêt) |
| hi.energ. | bande instable | unstable stop band (d'arrêt) |
| hi.energ. | bande instable | stop band (d'arrêt) |
| el. | bascule instable | multivibrator |
| fin. | capitaux instables | hot money |
| fin. | capitaux instables | volatile funds |
| fin. | capitaux instables | volatile capital |
| el.tract. | caractéristique instable | unstable characteristic |
| med. | centre de commande instable | wandering pace-maker |
| tech. | chenal instable | unstable channel |
| comp. | circuit instable | astable circuit |
| gen. | configuration instable | unstable configuration |
| life.sc. | couche instable | unstable layer |
| automat. | cycle limite instable | unstable limit cycle |
| astr. | dans un état instable à l'état non stationnaire | in non-steady state |
| med. | diabète instable | labile diabetes |
| med. | diabète instable | brittle diabetes |
| chem. | explosible instable | unstable explosive |
| chem. | Explosif instable. | Unstable explosives. |
| life.sc. | extrêment instable | extremely unstable |
| nat.res. | fermentation de méthane instable | instable methane fermentation |
| fin. | flux de capitaux instables | mobile capital flows |
| automat. | foyer instable | unstable focus |
| med. | gène instable | mutable gene |
| gen. | il est d'un tempérament plutôt instable | he's got a rather unstable character |
| health. | interféron alpha instable en milieu acide | acid labile alpha interferon |
| life.sc., construct. | lit instable | unstable channel |
| life.sc. | légèrement instable | slightly unstable |
| transp. | marche instable | uneven running |
| market. | marché instable | sensitive market |
| life.sc. | masse d'air instable | unstable air mass |
| life.sc. | modérément instable | moderately unstable |
| construct. | mouvement instable | unstable motion |
| nucl.phys., radiat. | noyau instable | decaying nucleus |
| radiat. | noyau instable | unstable nucleus |
| nucl.phys., radiat. | noyau instable à la fission | nucleus unstable with respect to fission |
| radiat. | noyau instable à la fission | nucleus unstable to fission |
| nucl.phys., radiat. | nucléide instable | decaying nuclide |
| radiat. | nucléide instable | unstable nuclide |
| automat. | nœud instable | unstable node |
| met. | opération de débouchage instable | non-steady teeming operation |
| hi.energ. | orbite d'équilibre instable | unstable equilibrium orbit |
| commun. | oscillation instable | instable oscillation |
| life.sc. | pente instable | unstable slope |
| hi.energ. | phase d'équilibre instable | unstable synchronous phase |
| hi.energ. | phase d'équilibre instable | unstable equilibrium phase |
| automat. | point d'équilibre instable | unstable equilibrium point |
| earth.sc., mech.eng. | point d'équilibre longitudinal instable | longitudinally unstable equilibrium point |
| automat. | point nodal instable | unstable nodal point |
| automat. | procès instable de réglage | unstable control operation |
| earth.sc. | profil de courant de peau instable | unstable skin current profile |
| earth.sc., met. | rupture instable | unstable fracture |
| chem. | substance instable dans l'eau | water-unstable substance |
| gen. | synchronisation instable | sync variation |
| astr. | système instable | system in a non-steady state |
| construct. | système instable | unstable system |
| automat. | système à structure instable | structurally unstable system |
| dialys. | séance instable | unstable treatment |
| gen. | séparation des éléments instables | separation of unstable elements |
| life.sc., construct. | terrain instable | unstable slope |
| transp., mech.eng. | travailleur instable | turnover prone employee |
| transp., mech.eng. | travailleur instable | short-term employee |
| forestr. | vent instable | variable wind direction |
| water.res. | écoulement instable | variable flow |
| water.res. | écoulement instable | unsteady flow |
| water.res. | écoulement instable | non-permanent flow |
| commun., transp. | écoulement instable | unstable flow |
| health., nat.sc. | élément instable | jumping gene |
| radiat. | élément instable | unstable element |
| earth.sc. | équation cinétique d'un plasma instable | kinetic equation for an unstable plasma |
| agric., mech.eng. | équilibre instable | unstable equilibrium |
| IT, tech. | état instable | quasistable state |
| IT, tech. | état instable | unstable state |
| IT, tech. | état instable | metastable state |
| comp. | état instable | instable state |
| reliabil. | état potentiellement instable d'un réseau d'énergie électrique | insecure state of an electric power system |
| reliabil. | état potentiellement instable d'un réseau d'énergie électrique | potentially unstable state of an electric power system |
| astr. | étoile instable | non-stable star |
| gen. | être en équilibre instable | be balanced precariously |