inchoate (en)

just begun and so not fully formed or developed; rudimentary

plangent (en)

loud, reverberating, and often melancholy

soporific (en)

(adjective) causing or tending to cause sleep / (adjective) tending to dull awareness or alertness / (adjective) of, relating to, or marked by sleepiness or lethargy / (noun) a soporific agent / (noun) hypnotic