nobosemashita.

I became light-headed from the bath.

Breakdown of nobosemashita.

• のぼせる: to become light-headed from a hot bath

Questions & Answers about nobosemashita.

What is the dictionary form of のぼせました?

The dictionary form is のぼせる.

So the breakdown is:

• のぼせる = dictionary/plain form
• のぼせました = polite past form

This is an ichidan verb (a る-verb), so it changes like this:

• のぼせる → plain non-past
• のぼせます → polite non-past
• のぼせた → plain past
• のぼせました → polite past

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What does ました mean here?

ました makes the verb both:

• polite
• past

So のぼせました means that the action or state happened already, and the speaker is saying it politely.

Very roughly:

• のぼせた。 = plain/casual
• のぼせました。 = polite

This is the standard ます-form past tense.

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Why is there no subject, like 私が?