Sometimes it depends on what type of dictionary it is.
Some antonyms for heartily include: gravely, indifferently.
Antonyms for "modern" could include traditional, outdated, or old-fashioned. Antonyms for "fresh" could include stale, old, or rotten.
Antonyms for gallantry: Cowardice, timidity. Synonyms for gallantry: Bravery, chivalry.
Antonyms of "Paradox" include "Plausible", "Possible", "Feasible", and "Thesis".
Antonyms of theory include fact, reality, evidence, and truth.
Antonyms for ill include healthy, robust, well (as in, 'I am well') and recovering.
Antonyms for raconteur would include "truth-teller" or "straight shooter."
Antonyms of "merge" are separate, divide, or disconnect. Synonyms for "separate" include divide, detach, or segregate.
Antonyms for parry include, but are not limited to: meet, face, encounter, confront, allow, and attract.
Antonyms of kindle would include: douse, extinguish, quench and turn off.
Some antonyms for the word act include inaction, quiet, inactivity, and stoppage. Some synonyms include action, undertaking, move, and doing.
The synonyms for grave include grave site, tomb, vault, mausoleum and crypt. The antonyms for grave include trivial and cheerful.