DEFECTIVELY
defectively
(adverb) in a defective manner; “this machine functions only defectively”
Source: WordNet® 3.1
Etymology
Adverb
defectively (comparative more defectively, superlative most defectively)
In a defective manner.
Source: Wiktionary
DEFECTIVE
De*fect"ive, a. Etym: [L. defectivus: cf. F. défectif. See Defect.]
1. Wanting in something; incomplete; lacking a part; deficient;
imperfect; faulty; -- applied either to natural or moral qualities;
as, a defective limb; defective timber; a defective copy or account;
a defective character; defective rules.
2. (Gram.)
Definition: Lacking some of the usual forms of declension or conjugation;
as, a defective noun or verb.
– De*fect"ive*ly, adv.
– De*fect"ive*ness, n.
Source: Webster’s Unabridged Dictionary 1913 Edition