instrumenter, v.n., (jur.) to act; to draw up deeds, indentures, etc.; to serve writs; to compose instrumental music.
instrumentiste, n.m., instrumentalist.
à l’insu, prep., unknown to. À mon —, à votre —; unknown to me, unknown to you; unknowingly, unwittingly, unconsciously. A l’— de son père; unknown to his father.
insubmersible, adj., unsinkable.
insubordination, n.f., insubordination.
insubordonné, -e, adj., insubordinate.
insuccès, n.m., failure, want of success.
insuffisamment, adv., insufficiently.
insuffisance, n.f., insufficiency, incapacity.
insuffisant, -e, adj., insufficient, inadequate.