彼はじっとすわって、できるだけ良い印象を与えようとした。

he; him; his; boyfriend

topic marker particle; indicates contrast with another option (stated or unstated); adds emphasis

motionlessly (e.g. stand, wait); (be) still; fixedly (e.g. gaze, stare); intently (e.g. listen, think); patiently (endure); stoically; firmly (e.g. hold); restrained

to sit; to squat; to assume (a position); to hold steady; to hold still

as much as one can; as much as possible; if at all possible

good; excellent; fine; nice; pleasant; agreeable; sufficient (can be used to turn down an offer); ready; prepared; profitable (e.g. deal, business offer, etc.); beneficial; OK

impression

indicates direct object of action; indicates subject of causative expression; indicates an area traversed; indicates time (period) over which action takes place; indicates point of departure or separation of action; indicates object of desire, like, hate, etc.

to give (esp. to someone of lower status); to bestow; to grant; to confer; to present; to award; to provide; to afford; to offer; to supply; to assign; to cause; to pass (a variable to a function)

if; when; and; with; particle used for quoting (with speech, thoughts, etc.); quoting particle; promoted pawn; indicates question (sentence end)

to do; to cause to become; to make (into); to turn (into); to serve as; to act as; to work as; to wear (clothes, a facial expression, etc.); to judge as being; to view as being; to think of as; to treat as; to use as; to decide on; to choose; to be sensed (of a smell, noise, etc.); to be (in a state, condition, etc.); to be worth; to cost; to pass (of time); to elapse; verbalizing suffix (applies to nouns noted in this dictionary with the part of speech "vs"); creates a humble verb (after a noun prefixed with "o" or "go"); to be just about to; to be just starting to; to try to; to attempt to