complain

As verbs the difference between complain and doubt

is that complain is to express feelings of pain, dissatisfaction, or resentment while doubt is to lack confidence in; to disbelieve, question, or suspect.

As a noun doubt is

uncertainty, disbelief.

As a verb complain

is to express feelings of pain, dissatisfaction, or resentment.

As an adjective lenient is

lax; tolerant of deviation; permissive; not strict.

As a noun lenient is

a lenitive; an emollient.

As a verb complain

is to express feelings of pain, dissatisfaction, or resentment.

As a noun escalation is

an increase or rise, especially one to counteract a perceived discrepancy.

As verbs the difference between retain and complain

is that retain is to keep in possession or use while complain is to express feelings of pain, dissatisfaction, or resentment.

As verbs the difference between declare and complain

is that declare is while complain is to express feelings of pain, dissatisfaction, or resentment.

In intransitive terms the difference between complain and brag

is that complain is to make a formal accusation or bring a formal charge while brag is to boast; to talk with excessive pride about what one has, can do, or has done.

As a noun brag is

a boast or boasting; bragging; ostentatious pretence or self-glorification.

As an adjective brag is

first-rate.

As an adverb brag is

proudly; boastfully.

Complain is a synonym of bewail.

As verbs the difference between complain and bewail

is that complain is to express feelings of pain, dissatisfaction, or resentment while bewail is to wail over; to feel or express deep sorrow for.

As verbs the difference between snarl and complain

is that snarl is to form raised work upon the outer surface of (thin metal ware) by the repercussion of a snarling iron upon the inner surface while complain is to express feelings of pain, dissatisfaction, or resentment.

As a noun snarl

is a knot or complication of hair, thread, or the like, difficult to disentangle; entanglement; hence, intricate complication; embarrassing difficulty.

As verbs the difference between complain and request

is that complain is to express feelings of pain, dissatisfaction, or resentment while request is to express the need or desire for.

As a noun request is

act of requesting.

In lang=en terms the difference between investigate and complain

is that investigate is to conduct an inquiry or examination while complain is to make a formal accusation or bring a formal charge.

As verbs the difference between investigate and complain

is that investigate is to inquire into or study in order to ascertain facts or information while complain is to express feelings of pain, dissatisfaction, or resentment.