| Important Canadian livestock feed | 33 |
| Important caviar source, with "the" | 45 |
| Important college football games | 32 |
| Important computer industry port | 32 |
| Important considerations in Cy Young Award voting | 49 |
| Important constituent of igneous rocks | 38 |
| Important digestive acid, chemically | 36 |
| Important digits on an I.R.S. form | 34 |
| Important drive in Freudian theory | 34 |
| Important energy source for the brain | 37 |
| Important exam for college hopefuls | 35 |
| Important first step, metaphorically | 36 |
| Important fortress in the Crusades | 34 |
| Important group in cell metabolism | 34 |
| Important info for making connections | 37 |
| Important info for people with connections | 42 |
| Important ingredient in DNA repair | 34 |
| Important joint for a field goal kicker | 39 |
| Important means of communing with Jah | 37 |
| Important meeting for Domingo and colleagues? | 45 |
| Important name in Chinese history | 33 |
| Important name in Virginia history | 34 |
| Important no. to most car buyers | 32 |
| Important number on Downing Street | 34 |
| Important part of a slide projector | 35 |
| Important part of some proposals | 32 |
| Important parts of reference books | 34 |
| Important parts of Thanksgiving and Easter | 42 |
| Important parts of the body's defense system | 48 |
| Important peninsula in the Six-Day War, 1967 | 44 |
| Important percentage for leadoff hitters | 40 |
| Important plant in alternative medicine | 39 |
| Important quality in products for toddlers | 42 |
| Important role for the federal government | 41 |
| Important role in "Our Town" | 38 |
| Important score for Tiger Woods? | 32 |
| Important seven-day TV ratings period | 37 |
| Important shipping route opened in 1914 | 39 |
| Important sign in a crowded venue | 33 |
| Important source of commissions: Abbr. | 38 |
| Important stat to a pitching coach | 34 |
| Important substance in immune development | 41 |
| Important tool in insider trading | 33 |
| Imported Portuguese dessert wine? | 33 |
| Imposed on others' generosity | 33 |
| Imposer of a drunk's comeuppance | 36 |
| Imposing a general liability, legally | 37 |
| Imposing look from an angry king? | 33 |
| Imposing monetary penalties with a nice Chianti? | 48 |
| Imposing Wimbledon presence in the '80s-90s | 47 |
| Imposition on drinking with recycling? | 38 |
| Impossibility if you keep your mouth shut | 41 |
| Impossible Missions Force leader | 32 |
| Impossible Missions Force leader Jim | 36 |
| Impossible number in a football score | 37 |
| Impossible point total in American pro football | 47 |
| Impossible score, in U.S. football | 34 |
| Impossible, and hint to this puzzle's theme | 47 |
| Impossible, like an upset victory | 33 |
| Impossibles song "Erin With ___" | 42 |
| Imposter pretending to be from Manama? | 38 |
| Impractical wrinkle smoother [CALIFORNIA] | 41 |
| Impresario Hurok: 1888–1974 | 34 |
| Impresario's production, perhaps | 36 |
| Impression obtained by the senses | 33 |
| Impression taken at a crime scene | 33 |
| Impressionist composition of 1905 | 33 |
| Impressionist Edgar who painted ballerinas | 42 |
| Impressionist painter Childe ___ | 32 |
| Impressionist painter of "The Bathers" | 48 |
| Impressionist painter of ballerinas | 35 |
| Impressionist painter: 1834–1917 | 39 |
| Impressionist's study of a washerwoman? | 43 |
| Impressions left at parking lots | 32 |
| Impressive way to solve a puzzle | 32 |
| Impressive, as a speech or performance | 38 |
| Impressive, though lacking substance | 36 |
| Imprint of Holtzbrinck publishers | 33 |
| Imprisoned Chinese journalist Tao | 33 |
| Imprisoned Peace Nobelist ___ Xiaobo | 36 |
| Imprisoned WorldCom cofounder Bernie | 36 |
| Imprisoners of Charlton Heston in 1968 | 38 |
| Impromptu hitching, perhaps (+o) | 32 |
| Impromptu, wide-ranging conversation | 36 |
| Improper attire at most golf clubs | 34 |
| Improper name for a eucalyptus muncher | 38 |
| Improper trade of a St. Louis N.F.L. player? | 44 |
| Improper way to write 59 in Roman numerals | 42 |
| Improperly failed to follow suit | 32 |
| Improperly install improved computer programs? | 46 |
| Improperly paid for favorable treatment | 39 |
| Improv music popularized by Ella Fitzgerald | 43 |
| Improve a thesis' quality, e.g. | 35 |
| Improve in appearance, with "up" | 42 |
| Improve one's bargaining power, in a way | 44 |
| Improved one's looks hopefully | 35 |
| Improved, as one's skill level | 34 |
| Improvement of a Standardbred's gait? | 41 |
| Improvisational jazz singing style | 34 |
| Improvisational piece inspired by a calf? | 41 |