4. Atenuate: ( at·ten·u·ate)- Verb
To stretch out; prolong. To weaken or reduce in force, intensify, effect, quantity, or value.
Synonyms: Abate, constrict, contract, cripple, debilitate, deflate, disable, extenuate, lessen.
Antonyms: Expand, fortify, increase, intensify, strengthen
Asseveration: (as·sev·er·a·tion)- Noun
Declaration. An assertion made in very positive form; a solemn assertion. A declaration that is made emphatically (as if no supporting evidence were necessary). To declare seriously or positively; afffirm.
Synonyms: OK, affidavit, assertion, asseveration, attestation, averment, avouchment, avowal, certification, confirmation, declaration, green light, oath, pronouncement, ratification, statement, sworn statement, testimony
Antonyms: denial, refutation
Reference:
The Lexicon' - By William F. Buckley Jr.
Dictionary.com.
Thesaurus.com