I. adverb
( -er/-est )
Etymology: Middle English weikly, wekely, from weike, weke weak + -ly, adverb suffix
: in a weak manner
weakly agreed to a compromise
: to a weak degree : feebly , slightly
painting and drawing were weakly developed — Clark Wissler
II. adjective
( -er/-est )
Etymology: weak (I) + -ly, adjective suffix
: not strong or robust : feeble , weak
weakly infant
: sickly , puny
weakly plant