Early Primitive Elvish
tefe
root. *hate, dislike
atefe-
noun. strong dislike
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 unglossed root in the Qenya Lexicon of the 1910s with derivatives like ᴱQ. tempe “hate” and ᴱQ. teve- “hate, dislike” (QL/90), where the -v- was because intervocalic voiceless spirants became voiced in Early Qenya (PE12/17-19). It also had derivatives in the contemporaneous Gnomish Lexicon such as G. tîf “resentment, ill feeling, bitterness” (GL/70). I think it is worth positing a Neo-Root ᴺ√TEB “hate, dislike” to serve as the basis for Elvish “hate” words; I think it is the best option among the various other early roots Tolkien used for this purpose: the derivatives of ᴱ√ÞṆKṆ conflicts with later ᴹQ. sanka/N. thanc “cleft, split” < ᴹ√STAK (Ety/STAK), and ᴱ√MOKO as the final element of G. Gothmog was replaced by ᴹ√MBAW (Ety/MBAW).