INGRATIATE is validvalid

[v INGRATIATED, INGRATIATES, INGRATIATING] : INGRATIATINGLY [adv], INGRATIATION [n]

130,979 of 196,601 in NWL2023·also valid in CSW24

to commend (usually oneself) persuasively to someone's favour [v INGRATIATED, INGRATIATING, INGRATIATES]