| большой лоб; здоровый лоб Colloquial | a large forehead | 
| огромный лоб | an enormous forehead | 
| сократовский лоб | a Socratic forehead | 
| лобастый Substandard; большелобый | having a large forehead | 
| высокий лоб | a high forehead | 
| широкий лоб | a broad forehead | 
| NB
The size and shape of a forehead are considered to reflect a person's intellectual properties. Therefore the corresponding expressions have connotations of intelligence or, on the contrary, stupidity, narrow-mindedness; the expressions большой,
огромный, сократовский or высокий лоб, above, are associated with intelligence, while the expressions маленький, узкий or покатый лоб, below, are associated with stupidity.
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| небольшой лоб; маленький лоб | a small forehead | 
| низкий лоб; невысокий лоб | a low forehead | 
| Седые его волосы висели клочьями над невысоким лбом. [И. Тургенев, Дворянское гнездо] | Wisps of grey hair hung over his low forehead. [I. Turgenev, A Nest of Gentlefolk] | 
| низколобый | having a low forehead | 
| узкий лоб | a narrow forehead | 
| узколобый | having a narrow forehead | 
| NB
The word узколобый is also used metaphorically to mean "narrow-minded." Cf. твердолобый, used only metaphorically, which means "hard-headed, stubborn."
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| крутой лоб | a steep forehead | 
| крутолобый | having a steep forehead | 
| выпуклый лоб | a protuberant forehead | 
| покатый лоб | a sloping forehead | 
| прямой лоб | a straight forehead | 
| гладкий лоб | a smooth forehead | 
| мраморный лоб | a marble brow | 
| чистый лоб | a pure brow, usually a large, broad forehead with smooth skin | 
| ... веки его были чуть опущены, но лоб, чистый, мраморный, был невозмутим. [А. Битов, Уроки Армении] | ... his eyelids were lowered a bit, but his pure marble brow was imperturbable. [A. Bitov, Lessons of Armenia] | 
| ясный лоб | a clear brow, indicating that its possessor is untroubled, unworried | 
| безмятежный лоб Bookish | a serene forehead | 
| морщинистый лоб | a wrinkled brow, a furrowed brow | 
| морщины на лбуloc; складки на лбуloc | wrinkles on one's forehead, brow | 
| шишковатый лоб | a bumpy forehead | 
| открытый лоб | an uncovered forehead, i.e. usually a high forehead without a scarf, bangs, etc. on it | 
| лоб с залысинамиi | a receding hairline | 
| красивый лоб | a pretty forehead | 
| некрасивый лоб | an unattractive forehead, an ugly forehead | 
| умный лоб | an intelligent forehead | 
| лоб мыслителяg | a thinker's brow | 
| дегенеративный лоб | a degenerate brow | 
| упрямый лоб | a stubborn forehead | 
| белолобый | having a star or blaze on its forehead | 
| NB
The above word is used only of animals with a star or blaze on their foreheads.
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