Well-made, hard-wearing.
Sturdy is not a verb but an adjective and therefore has no past tense, unless you mean "this was sturdy" etc.
words that mean the same as also
Some words are sanitation and sanitize but they mean the exact same thing.
If, by sturdy, you mean rigid, the answer is no. Without a diagonal brace, a square can easily be distorted into a rhombus.
Not sturdy or lasting
No, "registration" typically refers to creating a new account or profile, while "sign in" is used to access an existing account by providing credentials. Registration involves setting up a new user account, while signing in involves using an existing account to access a platform or service.
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Sturdily means in a sturdy manner. For example, a table can be sturdily built. Sturdy means solid or firm.
Some words that mean the same as black are dark, ebony, and sable.