easily

Synonyms: calmly comfortably competently conveniently coolly dexterously efficiently effortlessly evenly facilely fluently freely handily hand over fist hands down just like that lightly like nothing no sweat nothing to it piece of cake plainly quickly readily regularly simply smoothly steadily surely swimmingly uncomplicatedly well with ease with no effort without a hitch without trouble

Antonyms: difficultly

Synonyms: absolutely actually almost certainly assuredly beyond question by far certainly clearly decidedly definitely doubtless doubtlessly far and away indeed indisputably indubitably no doubt plainly positively probably really surely truly undeniably undoubtedly unequivocally unquestionably

Antonyms: doubtedly dubitably questionably