chest, breast / heart, inner thoughts

inside

(Internet slang) Short for 胸が熱くなる.

think

is the best among (others)

厚い: thick / 厚い, 篤い: hearty, sincere, warm / 篤い: (of sickness) serious

熱い: (of an object or feeling) hot / 熱い: (of one's body temperature) hot, feverish / 熱い: ardent, enthusiastic, impassionate / 熱い: (of love between a couple) passionate / 暑い: (of weather) hot, baking

Ka-ending dialect form of あつい (atsui, “hot”)

忠厚: a male given name

(transitive) to heat up / (intransitive) to heat