VERBS appear, be, look, seem, sound | become | make sth
ADV. extremely, highly, really, remarkably, very | fully, perfectly The procedure is not fully efficient: improvements could be made. We already have a perfectly efficient system?why change it? | increasingly | fairly, pretty, quite, reasonably, relatively | briskly, quietly The receptionist was briskly efficient. A quietly efficient manservant brought them coffee and brandy. | formidably, incredibly, superbly, supremely His secretary was formidably efficient: her minutes were works of art. | economically, mechanically, technically
PREP. at Their equipment was not as efficient at finding gold as today's machinery. | in The heating system is very efficient in its use of of fuel.