君がなんと言おうと、決心は変わりません。

Say what you will; I won't change my mind.

君(きみ)がなんと言(い)おうと、決心(けっしん)は変(か)わりません。

Kimi ga nanto iou to, kesshin wa kawarimasen.

君 (きみ)

you; buddy; pal; monarch; ruler; sovereign; (one's) master

が (が)

indicates sentence subject (occasionally object); indicates possessive (esp. in literary expressions); but; however; still; and

何と (なんと)

what; how; whatever

言う (いう、ゆう)

to say; to utter; to declare; to name; to call; to go (e.g. "the alarm went ping"); to make a noise

と (と)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

決心 (けっしん)

determination; resolution

は (は)

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

変わる (かわる)

to change; to be transformed; to be altered; to vary; to move to; to be different; to be uncommon; to be unusual

Readings: クン、きみ、 -ぎみ

Meanings: mister, you, ruler, male name suffix

Readings: ゲン、ゴン、い.う、こと

Meanings: say, word

Readings: ケツ、き.める、 -ぎ.め、き.まる、さ.く

Meanings: decide, fix, agree upon, appoint

Readings: シン、こころ、 -ごころ

Meanings: heart, mind, spirit, heart radical (no. 61)

Readings: ヘン、か.わる、か.わり、か.える

Meanings: unusual, change, strange