mintha

mint (“as”) +‎ ha (“if”)

mintha

(for an unreal condition) as if, as though
Úgy haragszik rám, mintha én lennék a hibás. ― S/he is angry at me as though I were at fault.
(for a real condition) Misspelling of mint ha.
Expresses uncertainty.
Mintha hallottam volna valami zajt. ― I think I heard a noise.

Depending on the context, it can be written as one or two words:^[1]

mintha: If the condition is not real, it is written in one word. In this case, the verb in the clause is in conditional mood.
Éjfélkor nem lehet olyan világos, mintha nappal volna. ― It can't be so bright at midnight as if it were daytime.
mint ha: If the condition is real, it is written in two words. In this case, the verb in the clause is in indicative mood and the adverb akkor (“then”) could be inserted between the two: “mint akkor, ha”
Jobban halad a munka, ha csinálod, mint ha csak beszélsz róla. ― The work progresses better if you do it than if you just talk about it.

[1]
Grétsy, László and Gábor Kemény, editors. Nyelvművelő kéziszótár (“Concise Dictionary for Language Cultivation”). Second, revised and extended edition. Budapest: Tinta Könyvkiadó, 2005. →ISBN

Hungarian