ILLEGIBLY

illegibly, undecipherably, unreadably

(adverb) in an illegible manner; “this student writes illegibly”

Source: WordNet® 3.1

Etymology

Adverb

illegibly (comparative more illegibly, superlative most illegibly)

In a manner that produces illegible results.

The doctor illegibly scrawled his signature: if it weren't on his letterhead, no-one would know who had written it.

Source: Wiktionary

ILLEGIBLE

Il*leg"i*ble, a.

Definition: Incapable of being read; not legible; as, illegible handwriting; an illegible inscription.

– Il*leg"i*ble*ness, n.

– Il*leg"i*bly, adv.

Source: Webster’s Unabridged Dictionary 1913 Edition