Early Quenya
mie
noun. mist, drizzle
mie
noun. bit, small piece
mike
adverb. little, a (little) bit; diminutive
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.
An adverb for “little” in the Early Qenya Grammar of the 1920s with a shorter form mit (PE14/48, 80), also used as a diminutive prefix with variant forms mie and mimīke (PE14/81). In the contemporaneous English-Qenya Dictionary it was translated as “a bit”, and its variant mimīke “a little bit” seems to be somewhat emphatic.
Neo-Quenya: For purposes of Neo-Quenya I would update this adverb to ᴺQ. nicë “a little, a bit” using the later root √NIK, and would use it to modify both adjectives and verbs: nicë maita “a little hungry”, pata nicë “walk a bit”.