Translation guide
Describes a person, plan, or expectation that is unrealistically hopeful or positive, often ignoring potential problems.
To say that someone is too hopeful or positive, often in a naive or unrealistic way.
Directly means 'too optimistic'. A straightforward and common way to describe someone.
彼は楽観的すぎると思う。
I think he's overly optimistic.
To say that a plan, estimate, or expectation is unrealistically hopeful and likely to fail.
Same as for people, but applied to plans or views.
その計画は楽観的すぎる。
That plan is overly optimistic.
甘い implies naivety or lack of rigor, often used for plans or judgments. 楽観的すぎる simply means 'too optimistic' and can be used for people or situations without the nuance of naivety.
彼の見積もりは甘い。
His estimate is naive/overly optimistic.
彼は楽観的すぎる。
He is overly optimistic.
Do not directly translate 'overly optimistic' as 過度に楽観的 (kado ni rakkanteki). While understandable, it sounds unnatural. Use the phrases above instead.
Literally 'sweet', but commonly used to mean 'naive' or 'overly optimistic' about a situation or person.
彼の考えは甘いよ。
His thinking is overly optimistic.
Literally 'auspicious', but used sarcastically to mean 'naively optimistic' or 'simple-minded'.
あいつはおめでたいやつだ。
That guy is overly optimistic (naive).
Describes a carefree, overly optimistic person who doesn't worry enough. Often slightly negative.
彼は能天気すぎる。
He's way too carefree and optimistic.
An 'optimist' by nature. Can be neutral or slightly negative if implying unrealistic optimism.
彼は楽天家だから、心配しない。
He's an optimist, so he doesn't worry.
'Naive outlook' or 'overly optimistic forecast'. Common in business contexts.
それは甘い見通しだ。
That's an overly optimistic forecast.
'Wishful thinking' or 'optimistic speculation'. Often used when someone is basing hopes on desires rather than facts.
それは単なる希望的観測だ。
That's just wishful thinking.