dubious

As an adjective dubious

is arousing doubt; questionable; open to suspicion.

As a noun mirage is

an optical phenomenon in which light is refracted through a layer of hot air close to the ground, giving the appearance of there being refuge in the distance.

As a verb mirage is

to cause to appear as or like a mirage.

As adjectives the difference between blatant and dubious

is that blatant is bellowing, as a calf; bawling; brawling; clamoring; disagreeably clamorous; sounding loudly and harshly while dubious is arousing doubt; questionable; open to suspicion.

As an adjective dubious

is arousing doubt; questionable; open to suspicion.

As a noun qualm is

smoke.

As adjectives the difference between malicious and dubious

is that malicious is of, pertaining to, or as a result of malice or spite while dubious is arousing doubt; questionable; open to suspicion.

As adjectives the difference between dubious and undefined

is that dubious is arousing doubt; questionable; open to suspicion while undefined is lacking a definition or value.

As adjectives the difference between dubious and specious

is that dubious is arousing doubt; questionable; open to suspicion while specious is seemingly well-reasoned, plausible or true, but actually fallacious.

As a noun ersatz

is replacement, substitute.

As an adjective dubious is

arousing doubt; questionable; open to suspicion.

As adjectives the difference between dubious and false

is that dubious is arousing doubt; questionable; open to suspicion while false is untrue, not factual, factually incorrect.

As a noun false is

one of two options on a true-or-false test.

As an adverb false is

not truly; not honestly; falsely.

Dubious is a related term of shaky.

As adjectives the difference between dubious and shaky

is that dubious is arousing doubt; questionable; open to suspicion while shaky is shaking]] or [[tremble|trembling.