D “world” = kosmos. Perhaps from the base of komizo (to carry, convey, recover); from komeo (to take care of). This is order, the world, the universe, including its inhabitants. Literally, this is something that is ordered so it can refer to all creation. It can also refer to decoration in the sense that something is better ordered and, thus, made more beautiful. This is where “cosmos” and “cosmetics” come from.
E “hearts” = kardia. Literally the heart, but figuratively mind, character, inner self, will, intention, thoughts, feelings. Also, the center of something. The word heart is only used figuratively in the Old and New Testaments. This is where “cardiac” comes from.
F “be troubled” = tarasso. 18x in NT. This is trouble, agitate, stir up. It is motion back and forth, creating inner turmoil or confusion, roiling water.
G “be afraid” = deiliao. 1x in NT. From deilia (cowardice, reticence); from deilos (fearful, timid, faithless, fear of losing); {from deos (fear, reverence) or deido (to fear)}. This is to live in fear, be timid. It is living with an intense fear of consequences.