The eleven words below each conceal another word according to a certain pattern. The pattern is the same in all eleven words. Can you determine what it is and extract the hidden words?

1. THESAURUS
2. PREGNANCY
3. THANKLESS
4. SITUATION
5. SUPERCEDE
6. CURLINESS
7. BARBARIAN
8. STATUETTE
9. SLINGSHOT
10. HEARTLESS
11. INSOLVENT

Answers:

The hidden words are found by taking every other letter of the clue word, always beginning with the first letter:

1. ThEsAuRuS - TEARS
2. PrEgNaNcY - PENNY
3. ThAnKlEsS - TAKES
4. SiTuAtIoN - STAIN
5. SuPeRcEdE - SPREE
6. CuRlInEsS - CRIES
7. BaRbArIaN - BRAIN
8. StAtUeTtE - SAUTE
9. SlInGsHoT - SIGHT
10. HeArTlEsS - HATES
11. InSoLvEnT - ISLET 

Credit: GAMES Magazine
April, 1992
Fraser Simpson
NESTED WORDS (adapted)