know ins and outs

adequate capable decent efficient proficient qualified skilled

adapted all around appropriate au fait being a pistol clever complete crisp dynamite endowed enough equal fireball fit fool good know one's business know one's stuff know the answers know the ropes know the score no slouch on the ball paid one's dues pertinent polished satisfactory savvy sufficient suitable there up to it up to snuff up to speed wicked

impotent incapable incompetent inept insufficient unable unqualified unskilled unsuitable

inadequate inefficient

apprehensive careful cautious cognizant conscious conversant knowledgeable observant respectful solicitous vigilant wary watchful

alert alive to au courant be up on cagey chary conscientious heedful in the know know all the answers knowing observative observing on one's toes on the ball on the job on to plugged in regardful sensible thoughtful tuned-in with eyes peeled

careless heedless ignorant inattentive incautious indifferent indiscreet negligent quiet rash thoughtless unafraid unaware uncareful uninformed unmindful unobservant unworried

absent-minded