simple past tense and past participle of ingrain

A lack or absence of gratitude; thanklessness.

The specific compound in a natural or man-made mixture that is responsible for the mixture's activity.

Which ingratiates; which attempts to bring oneself into the favour of another, often with flattery or insincerity.

present participle of ingratiate

(botany) Any of the genus Inga of small tropical trees and shrubs.

(transitive) To dye with a fast or lasting colour. / (transitive, figuratively) To make (something) deeply part of something else.

Dyed with grain, or kermes. / Dyed before manufacture; said of the material of a textile fabric; hence, in general, thoroughly inwrought; forming an essential part of the substance.

An ingrain fabric, such as a carpet.

Naive and trusting. / Demonstrating childlike simplicity. / Unsophisticated; clumsy or obvious. / Unable to mask one's feelings. / Straightforward, candid, open, and frank.