to use one's head

the way one feels unsettled due to fright / the way one is upset

earnest, sincere

a controller (an electronic or mechanical device to control a device or system) / (sciences) an experimental control; a member of a control group

to control (something), manage

portable stove

The hiragana syllable ろ (ro). Its equivalent in katakana is ロ (ro). It is the forty-third syllable in the gojūon order; its position is ら行お段 (ra-gyō o-dan, “row ra, section o”).

炉: furnace, kiln

(endearing) denotes endearment

理論: a theory