unhealthy

As adjectives the difference between unhealthy and unnatural

is that unhealthy is characterized by, or conducive to poor health while unnatural is not natural; supernatural or artificial.

As adjectives the difference between weakly and unhealthy

is that weakly is frail, sickly or of a delicate constitution; weak while unhealthy is characterized by, or conducive to poor health.

As an adverb weakly

is with little strength or force.

As adjectives the difference between unhealthy and perilous

is that unhealthy is characterized by, or conducive to poor health while perilous is dangerous, full of peril.

As adjectives the difference between unhealthy and healthless

is that unhealthy is characterized by, or conducive to poor health while healthless is unhealthy.

Unhealthy is a related term of faint.

As adjectives the difference between unhealthy and faint

is that unhealthy is characterized by, or conducive to poor health while faint is lacking strength; weak; languid; inclined to swoon; as, faint with fatigue, hunger, or thirst.

As a noun faint is

the act of fainting.

As a verb faint is

to lose consciousness caused by a lack of oxygen or nutrients to the brain, usually as a result of a suddenly reduced blood flow (may be caused by emotional trauma, loss of blood or various medical conditions).

Dangerous is a related term of unhealthy.

As adjectives the difference between dangerous and unhealthy

is that dangerous is full of danger while unhealthy is characterized by, or conducive to poor health.

As adjectives the difference between unhealthy and unwell

is that unhealthy is characterized by, or conducive to poor health while unwell is not well; indisposed; not in good health; somewhat ill; ailing.

Unhealthy is a related term of baneful.

As adjectives the difference between unhealthy and baneful

is that unhealthy is characterized by, or conducive to poor health while baneful is exceedingly harmful; causing harm, death, ruin.

As adjectives the difference between unhealthy and adverse

is that unhealthy is characterized by, or conducive to poor health while adverse is unfavorable; antagonistic in purpose or effect; hostile; actively opposing one's interests or wishes; contrary to one's welfare; acting against; working in an opposing direction.