Odd word or word pair: the opposite-meaning one among synonyms

This type of question, asked 4 times: 13 Sep 2024 S3, 18 Sep 2024 S1, 14 Sep 2025 S3, 16 Sep 2025 S2. All 4 questions below, oldest first.

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Question 1
13 Sep 2024 S3
4 $The following contains two pairs of words which are related to each other in a certain way. Three of the following four word-pairs are alike as these have the same relationship and thus form a group. Which word-pair does NOT belong to that group? (The words must be considered as meaningful English words and must not be grouped based on the number of letters/number of consonants/vowels in the word)$
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Question 2
18 Sep 2024 S1
7 $The question contains pairs of words that are related to each other in a certain way. Three of the following four word pairs are alike as these have the same relationship and thus form a group. Which word pair is the one that DOES NOT belong to that group? (The words must be considered as meaningful English words and must not be related to each other based on the number of letters/number of consonants/vowels in the word.)$
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Question 3
14 Sep 2025 S3
14 $Find the word that does not fit in the series: Silent, Muted, Tranquil, Clamorous, Calm$
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Question 4
16 Sep 2025 S2
13 $Find the word that does not fit in the series: Complex, Intricate, Sophisticated, Simple, Elaborate$
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Question 1