The phrase "are convenient" can be described by a number of antonyms that convey the opposite meaning. Words like inconvenient, troublesome, awkward, problematic, and unwieldy are all antonyms for "convenient". Inconvenient denotes something that causes difficulty, whereas troublesome suggests something that is bothersome or causes annoyance. Awkward signifies something that is difficult to use or manage, while problematic implies something that poses difficulties, such as a complex task or situation. Lastly, unwieldy refers to something that is hard to handle or manage. All these antonyms highlight that something that is not convenient requires extra effort and creates obstacles.