Qenya
mitta
preposition/adverb. inwards, (?into)
mitta-
verb. to insert; to come in
minta
preposition/adverb. inwards, (?into)
hont
adverb. inwards
to
preposition. in
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 “inwards” appearing in the Declension of Nouns (DN) of the early 1930s, an allative form of ᴹQ. hom- “heart” (PE21/23, 25). Compare ablative ᴹQ. holmo “from the middle” and locative ᴹQ. humpe “in the middle” from the same document.