defencelessly vs defenceless

defencelessly is not an adjective while defenceless is an adjective.

Word	Noun	Adjective	Verb	Adverb
defencelessly	No	No	No	Yes
defenceless	No	Yes	No	Yes

As adverbs, defencelessly and defenceless are synonyms defined as:

Other synonyms of defencelessly include defenseless, defenselessly.

defencelessly (adjective)	defenceless (adjective)
	lacking weapons for self-defense
	lacking protection or support

defencelessly (adverb)	defenceless (adverb)
without defense	without defense