laughably

As a noun laugh

is an expression of mirth particular to the human species; the sound heard in laughing; laughter.

As a verb laugh

is (label) to show mirth, satisfaction, or derision, by peculiar movement of the muscles of the face, particularly of the mouth, causing a lighting up of the face and eyes, and usually accompanied by the emission of explosive or chuckling sounds from the chest and throat; to indulge in laughter.

As an adverb laughably is

in a manner that can be laughed at, humorous, in a laughable manner.

As adverbs the difference between laughably and laughingly

is that laughably is in a manner that can be laughed at, humorous, in a laughable manner while laughingly is with laughter or merriment.