noun
delusional mood
Psychiatric term for a pre-delusional state where the world feels uncanny, threatening, or personally significant without yet forming a fixed delusion.
統合失調症の初期には、妄想気分が現れることがある。
In the early stages of schizophrenia, a delusional mood may appear.
妄想 is a fixed false belief, while 妄想気分 is the vague, unsettling atmosphere that precedes it.
Compound of 妄想 (delusion) and 気分 (mood, atmosphere), likely a calque of German 'Wahnstimmung' or English 'delusional mood'.