Unripe
Immature, Inexperienced, Not Yet Good At
noun, な adjective, の adjective
Something that has not yet ripened, is, well, unripe. This is often used figuratively to say that someone is either immature or inexperienced, so you'll often encounter those usages!
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
まだまだ未熟で分からないことばかりですが、がんばります。
I'm still not that good at it and there are many things I don't understand, but I'll do my best.
未熟ながらも、解説させていただきました。
Despite my inexperience, I provided an explanation.
自分の未熟さを痛感しました。
I keenly felt my own immaturity.
俺も昔は未熟で好き勝手してたよ。
I used to be immature and I did whatever I wanted too.