i-adjective
Describes objects that take up a lot of space or are awkward to handle because of their size or shape.
この荷物はかさ高くて持ち運びにくい。
This luggage is bulky and hard to carry.
かさ高い家具を狭い部屋に置くのは難しい。
It's difficult to put bulky furniture in a small room.
i-adjective
Rare, literary use describing a person's arrogant or overbearing attitude. Not common in everyday speech.
彼のかさ高い態度に周囲は不快感を覚えた。
People around him felt uncomfortable with his haughty attitude.
かさばる is a verb meaning 'to be bulky' or 'to take up space,' often used for physical objects. かさ高い is an adjective with a similar physical meaning but can also carry a rare figurative sense of arrogance.
Compound of かさ (bulk, volume) + 高い (high). The figurative sense likely developed from the idea of someone acting 'big' or 'elevated' in manner.