Gnomish
nimp
adjective. pallid
aina
adjective. small
fail
adjective. pale, pallid
ineg
adjective. small
inig
adjective. small
There are more words but they are from Tolkien's earlier conceptional periods. Tolkien likely changed these words as he evolved the aesthetics and completeness of the languages. You may even find languages that Tolkien later rejected. Do not mix words from different time periods unless you are familiar with the phonetic developments.
Below: Tolkien's Late Period (1950–1973). These are from Tolkien's late conceptual period — his most settled forms of the languages. Prefer these over the earlier ones above when composing new text.
A word for “small” in the Gnomish Lexicon with variants ineg and G. inc (GL/51). Tolkien said this word was “especially used in quantitative sense as opposite of odog [great]”, as in inig bast no odog saith “✱small bread then great hunger”. It was clearly based on the early root ᴱ√INI “small” (QL/42).