がっかりする · noun or participle which takes 'suru'
| Form | Positive | Negative |
|---|---|---|
| Dictionary | がっかりする | がっかりしない |
| Polite | がっかりします | がっかりしません |
| Past polite | がっかりしました | がっかりしませんでした |
| Past | がっかりした | がっかりしなかった |
| Te-form | がっかりして | がっかりしないで |
| Desire | がっかりしたい | がっかりしたくない |
| Potential | がっかりできる | がっかりできない |
| Passive | がっかりされる | がっかりされない |
| Causative | がっかりさせる | がっかりさせない |
| Causative passive | がっかりさせられる | がっかりさせられない |
| Volitional | がっかりしよう | |
| Polite volitional | がっかりしましょう | |
| Imperative | がっかりしろ | がっかりするな |
| Conditional | がっかりすれば | がっかりしなければ |
| Tara conditional | がっかりしたら | がっかりしなかったら |
noun or participle which takes 'suru', adverb
be disappointed; feel let down; lose heart
The main modern use. Common as がっかりする for feeling disappointed or discouraged, and also adverbially as がっかりと to describe a dejected manner.
試験に落ちて、彼はがっかりしていた。
He was disappointed after failing the exam.
When she heard the result, her shoulders sank in disappointment.
noun or participle which takes 'suru', adverb
feel exhausted; feel drained
Much less common than the disappointment sense; it refers to losing energy or feeling worn out. In ordinary modern Japanese, ぐったりする or 疲れ切る is usually clearer for physical exhaustion.
The gakkari in “I was worn out from the long trip” is being used to mean exhausted.
I was disappointed by the exam results.
He always disappoints his family.
She left the room with a disappointed look on her face.
He dropped his shoulders in dejection.
がっかり is a casual, everyday expression for disappointment, whereas 落胆 is more formal and literary.
がっかり is the common adverb/する-verb for feeling let down, whereas すか is a noun naming the disappointing outcome itself.
がっかりする centers on disappointment as the cause, while 萎れる describes the visible dispirited appearance that can result from it.