"Dilate" means to become wider or expand. The opposite would be "narrow," which refers to making something smaller or more constricted.

Opposite words: Abridge, Abbreviate, Curtail, Dwindle, Narrow, 

"Repulsion" is a feeling of intense dislike or disgust. The opposite would be "attraction," which refers to the feeling of being drawn toward something or someone.

Opposite words:  Propensity, Fondness, Relish, Attraction.

"Discordant" refers to things that are in disagreement or out of harmony. The opposite would be "harmonious," meaning in agreement or balance, especially in terms of sound or relationships.

Opposite words: Harmonious, Euphonious, Melodious, Sonorous, Mellifluent.

"Mutter" refers to speaking in a low, indistinct, or complaining voice, often in a feeble manner. The opposite would be "outspoken," which means speaking openly and honestly, without hesitation.

Opposite words: Whimper, Shout, Wine, Outspoken.

"Animosity" refers to strong hostility or hatred. The opposite would be "harmony," which means peaceful coexistence, agreement, or a lack of conflict.

Opposite words: Friendliness, Cordiality, Amity, Alliance.

"Bombastic" refers to speech or writing that is pompous, inflated, and full of unnecessary exaggeration. The opposite would be "unimpressive," which refers to something lacking in impact or significance.

Opposite words: Unadorned, Unrhetorical, Unimpressive. 

"Sterilize" means to make something free from germs or bacteria. The opposite would be "adulterate," meaning to contaminate or add harmful substances to something, especially food or drink.

Opposite words: Adulterate, Blend, Taint, Dilute.

"Inundate" means to overwhelm or flood with things or people. The opposite would be "Parched" or "dehydrate," which means to remove or reduce something, especially to a point where it becomes scarce or dry.

Opposite words: Drain, Dehydrate, Parched.

"Stolid" refers to someone who is calm, showing little emotion or responsiveness. The opposite would be "excitable," referring to someone who is easily excited or responsive.

Opposite words: Responsive, Interested, Exuberant, Excitable.

"Quell" means to suppress, calm, or put an end to something, especially unrest or disorder. The opposite would be "foment," meaning to provoke or stir up something, such as unrest or trouble.

Opposite words: Instigate, Foment, Patron, Conspiracy.