あたたかい

Etymology
Shift in usage from older -na adjective form. First cited in 1703.

Via root, cognate with and.

Pronunciation

 * (Kyoto) $\overline{あたた}$かい [átátáꜜkàì]

Adjective

 * 1)  physically warm
 * 2)  financially well off, rich
 * 3)  thoughtful, understanding, emotionally warm

Usage notes

 * Depending on the author, the different kanji spellings might be used to distinguish specific nuances of meaning.  may emphasize "surrounding warmth", primarily the temperature of the weather, but also a warm and cozy sweater or futon (as opposed to one that is physically hot, such as from the dryer or heated by an electric blanket).  By contrast,  emphasizes the temperature of objects or the subjective impression of feelings.