Middle Primitive Elvish
laikā
adjective. keen, sharp, acute
laik
root. keen, sharp, acute
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 root in The Etymologies of the 1930s glossed “keen, sharp, acute” with derivatives like ᴹQ. laika/N. lhaeg of the same meaning; apparently the root was the result of a-fortification of ᴹ√LIK (Ety/LAIK; EtyAC/LAIK). It was thus distinct from ᴹ√LÁYAK “✱green, fresh” (Ety/LÁYAK). The root ᴹ√LAIK was clearly a later iteration of unglossed ᴱ√LAIKA from the Qenya Lexicon of the 1910s with derivatives like ᴱQ. laika “keen, sharp” (QL/50), but in the contemporaneous Gnomish Lexicon Tolkien gave the primitive form as ᴱ✶leika > both G. (g)leg “keen, sharp, piercing” and ᴱQ. laika (GL/53). Since [[eq|[ei] became [ai]]] in Early Qenya, ᴱ✶leika seems more represenative of the 1910s form of this root.