of unsound physical or mental health; unwell; sick

She felt ill, so her teacher sent her to the nurse.

objectionable; unsatisfactory; poor; faulty

ill manners.

hostile; unkindly

ill feeling.

evil; wicked; bad

of ill repute.

unfavorable; adverse

ill fortune.

of inferior worth or ability; unskillful; inexpert

an ill example of scholarship.

an unfavorable opinion or statement

I can speak no ill of her.

harm or injury

His remarks did much ill.

trouble, distress, or misfortune

Many ills befell him.

evil

to know the difference between good and ill.

sickness or disease.

in an ill manner.

unsatisfactorily; poorly

It ill befits a man to betray old friends.

in a hostile or unfriendly manner.

unfavorably; unfortunately.

with displeasure or offense.

faultily; improperly.

with difficulty or inconvenience; scarcely

Buying a new car is an expense we can ill afford.

ill at ease

socially uncomfortable; nervous

They were ill at ease because they didn't speak the language.

adjective

good , healthy , sound , strong , well

noun

benefit , blessing , fortune , happiness , luck , privilege , profit , prosperity

adjective

afflicted , ailing , a wreck , below par * , bummed , diseased , down , down with , feeling awful , feeling rotten , feeling terrible , got the bug , indisposed , infirm , laid low , off one’s feet , on sick list , out of sorts * , peaked , poorly , queasy , rotten , run-down , running temperature , sick as a dog , under the weather * , unhealthy , unwell , woozy * , acrimonious , adverse , antagonistic , cantankerous , cross , damaging , deleterious , detrimental , disrespectful , disturbing , foreboding , foul , harmful , harsh , hateful , hostile , hurtful , ill-mannered , impertinent , inauspicious , inimical , iniquitous , injurious , malevolent , malicious , nocent , nocuous , noxious , ominous , ruinous , sinister , sullen , surly , threatening , unfavorable , unfortunate , unfriendly , ungracious , unkind , unlucky , unpromising , unpropitious , unwholesome , vile , wicked , wrong , bad , evil , mischievous , cachectic , cadaverous , invalid , morbid , pernicious , sick , under the weather , untoward , valetudinarian

noun

abuse , affection , affliction , ailment , badness , complaint , condition , cruelty , damage , depravity , destruction , disease , disorder , evil , harm , hurt , illness , indisposition , infirmity , injury , insult , malady , malaise , malice , mischief , misery , pain , sickness , suffering , syndrome , trial , tribulation , trouble , unpleasantness , wickedness , woe , wrong , bad , bane , plague , scourge , adverse , adversity , ailing , amiss , baneful , cachexia , cruel , defective , diseased , harmful , hostile , ictus , indisposed , invalid , misfortune , noxious , poor , poorly , queasy , relapse , sick , sickly , under the weather , unfriendly , unhealthy , unlucky , unwell , wicked