'Abundant' means plentiful or existing in large quantities.

'Arduous' means requiring a lot of effort, which is similar to 'difficult'.

'Meticulous' means showing great attention to detail, which is similar to 'thorough'.

'Transient' means lasting for a short time, which is similar to 'temporary'.

A 'gregarious' attitude is sociable and friendly, which would make someone popular.

A 'deliberate' decision-making process is careful and considered, which fits the context.

The context suggests that the new evidence confirms the scientist's findings, making 'supported' the best choice.

'Ambiguous' means open to more than one interpretation; not having one obvious meaning.

'Meticulous' means showing great attention to detail; very careful and precise.

'Pragmatic' refers to dealing with things sensibly and realistically in a way that is based on practical rather than theoretical considerations.

'Pragmatic' refers to dealing with things sensibly and realistically.

'Quintessential' refers to the most perfect or typical example of a quality or class.

'Resilient' refers to the ability to recover quickly from difficulties.

'Ubiquitous' means being present or existing everywhere.

'Benevolent' refers to someone who is kind and generous.

'Ambiguous' means open to more than one interpretation; not having one obvious meaning.

'Candid' refers to being truthful and straightforward.

'Ephemeral' describes something that lasts for a very short time.

'Quintessential' refers to the most perfect or typical example of a quality or class.

'Resilient' describes the ability to recover quickly from difficulties.

'Superfluous' means unnecessary, especially through being more than enough.

'Benevolent' means well-meaning and kindly, while 'malevolent' means having a wish to do evil.

'Diligent' means hardworking, so the opposite is 'lazy'.

'Optimistic' means hopeful about the future, while 'pessimistic' means expecting the worst.