kekkou mayotte iru nara, kyou ha keiyakusinaide kaettara dou?

Here けっこう means something like quite, fairly, or pretty.

So けっこう迷っている means you’re pretty undecided or you’re hesitating quite a bit.

A common beginner trap is thinking けっこう only means fine or no thanks, as in replies like けっこうです. But in this sentence, it is an adverb modifying 迷っている.

It can mean either, depending on context.

The verb 迷う can mean:

• to get lost
• to be at a loss
• to hesitate
• to be undecided

In this sentence, because it is followed by 契約しないで帰ったらどう？, it clearly means being unsure / hesitating / unable to decide, not physically being lost.

So けっこう迷っている means:

• you seem pretty unsure
• you’re hesitating quite a lot
• you’re having a hard time deciding

迷っている is the -te iru form, which often describes an ongoing state.

Here it means the person is currently in a state of indecision.

Compare:

• 迷う = to hesitate / to be unsure
• 迷っている = is hesitating / is currently unsure
• 迷った = hesitated / became unsure / was unsure

So 迷っているなら means if you’re feeling unsure or if you’re still undecided.

This sounds more natural than 迷うなら here, because the speaker is reacting to the listener’s present state.

なら means if it’s the case that... or if...

So:

• けっこう迷っているなら = if you’re pretty undecided
• more literally: if it’s true that you’re hesitating quite a bit

Compared with other conditionals, なら often feels like the speaker is taking the situation as given and responding to it.

It is very natural when the speaker is saying:

• If that’s how you feel, then...
• If that’s the situation, then...

So the sentence has the feeling: If you’re that unsure, then how about not signing today and just going home?

The は marks today as the topic or contrast point.

今日は suggests something like:

• as for today
• at least for today
• today, specifically

So 今日は契約しないで implies:

• don’t sign today
• maybe you can decide later, but for today, don’t do it

This can carry a slight contrastive nuance:

• not today
• you don’t have to decide today

If it were just 今日契約しないで, it would still be understandable, but 今日は sounds more natural and expressive here.

契約しないで comes from:

• 契約する = to make/sign a contract
• 契約しない = not make/sign a contract
• 契約しないで = without signing the contract / don’t sign it and...

In this sentence, it connects to 帰ったらどう:

• 契約しないで帰ったらどう？
• How about going home without signing?

The ないで form often means without doing X, do Y.

So the flow is:

1. don’t sign the contract
2. go home
3. how about doing that?

In this sentence, しないで is the natural choice because it means without doing.

• 契約しないで帰る = go home without signing
• 契約しなくて帰る is unnatural for this meaning

Why? Because 〜なくて often gives meanings like:

• reason/cause: because not...
• connection of states in certain contexts

But when you want to say without doing A, do B, 〜ないで is usually what you want.

So here:

• correct/natural: 契約しないで帰る
• not the normal choice: 契約しなくて帰る

〜たらどう？ is a common way to make a suggestion.

So 帰ったらどう？ means:

• How about going home?
• Why don’t you go home?

It is built from:

• 帰る = to go home
• 帰ったら = if you go home / when you go home
• 帰ったらどう？ = how would it be if you went home?

Even though it literally looks like a conditional, as a set expression 〜たらどう？ functions as a suggestion.

They are similar, but not exactly the same.

Both can suggest Why don’t you go home?, but:

• 帰ったらどう？ sounds a bit fuller and softer as a suggestion
• 帰れば？ can sound more direct, blunt, or casual depending on tone

Compare:

• 帰ったらどう？ = How about going home?
• 帰れば？ = Why don’t you just go home?

So in this sentence, 帰ったらどう？ sounds like a relatively gentle suggestion.

Japanese often leaves out subjects when they are obvious from context.

In this sentence, the listener is clearly the one who is:

• 迷っている = being undecided
• 契約しないで = not signing
• 帰る = going home

So even without あなた or 君, the meaning is clear.

A more explicit version would be something like:

• あなたがけっこう迷っているなら、今日は契約しないで帰ったらどう？

But that sounds less natural in ordinary conversation because Japanese usually prefers omission when the context is clear.

It is casual.

Clues:

• どう？ instead of どうですか
• no polite endings like です or ます
• plain form throughout

So this sounds like something a friend, coworker, family member, or a relatively informal advisor might say.

A more polite version could be:

• けっこう迷っているなら、今日は契約しないで帰ったらどうですか。
• or more naturally, かなり迷っていらっしゃるなら、今日は契約なさらずにお帰りになったらどうですか。
  though this becomes much more formal

So the original sentence is friendly and conversational.

Not especially. It sounds more like a considerate suggestion.

The speaker is basically saying:

• If you’re that unsure, you don’t need to decide today.
• Maybe just go home without signing.

Because it uses 〜たらどう？, it suggests an option rather than giving a direct command.

If the speaker wanted to sound stronger, they might say things like:

• 今日は契約しないほうがいいよ。 = You’d better not sign today.
• 今日は契約しないで帰って。 = Don’t sign today; go home.

So the original sentence is relatively soft and reasonable in tone.

It breaks down like this:

• けっこう迷っているなら
  = if you’re pretty undecided

• 今日は
  = as for today / today at least

• 契約しないで
  = without signing the contract

• 帰ったらどう？
  = how about going home?

So the full logic is:

If you’re pretty unsure, then for today, how about going home without signing the contract?

This is a very common Japanese pattern:

• [condition] なら、[suggestion] たらどう？

For example:

• 疲れているなら、今日は早く寝たらどう？
  = If you’re tired, why don’t you go to bed early today?