Insufficiently

[,ɪnsə'fɪʃəntli]

(adv.) to an insufficient degree; 'he was insufficiently prepared'.

Edited by Lester--From WordNet

(adv.) In an insufficient manner or degree; unadequately.

Typist: Yvette

I know that I lounged about the streets, insufficiently and unsatisfactorily fed. Charles Dickens. David Copperfield.
The lack of water caused not only personal inconvenience and business paralysis, but it occasioned real danger of disease through unflushed sewers and insufficiently drained pipes. Bertha M. Clark. General Science.
Perhaps I had fastened it insufficiently? Wilkie Collins. The Woman in White.

Typist: Yvette