na-adjective, noun
affected; pretentious; smug; conceited
Describes a person or their behavior as trying too hard to appear stylish, sophisticated, or superior, often in an irritating or laughable way. Can be used as a noun or na-adjective.
See also: 気障り
彼のきざな話し方が鼻につく。
His affected way of speaking gets on my nerves.
あの俳優はいつもきざなポーズをとる。
That actor always strikes a pretentious pose.
気障り is a different word meaning 'unpleasant feeling' or 'offense', not directly synonymous with きざ.
The kanji 気障 literally suggest 'spirit' and 'hindrance', but the word is a sound shift from きざわり (気障り), originally meaning 'unpleasant' or 'offensive'. The modern meaning of 'affected' or 'pretentious' developed from the idea of something that feels off-puttingly artificial.