friendly and sincere (in feeling, behaviour)

friendly, sociable

serious and determined

very enthusiastic

showing strong feeling

enthusiastic

strong; sincere; in good health

energetic, enthusiastic

implied though not openly expressed; done without questioning

included without question, inherent, absolute

(of feelings, behaviour etc) genuine; (of a person) not expressing feelings that are false

straightforward, honest

firmly fixed; loyal

loyal, steady

not hesitating

steadfast