All 6 Uses of

zeal
in
Arrowsmith

Martin turned on her with fury, statistics, vituperation, religious zeal, and confused metaphors.†
Chpt 3

zeal = active interest and enthusiasm

His classes listened with zeal, and memorized the sacred hundred and fifty favorite prescriptions.†
Chpt 5

Only, when I get to thinking about the way most of these damned profs don't even know what he's up to—" Martin was off again, and if Leora did not altogether understand the relation of the synthesis of antibodies to the work of Arrhenius, yet she listened with comfortable pleasure in his zeal, with none of Madeline Fox's gently corrective admonitions.†
Chpt 6

When Martin sought to show that they certainly knew very little about the superiority of fresh air to warmth in schools, about the hygienic dangers of dirty streets about the real danger of alcohol, about the value of face-masks in influenza epidemics, about most of the things they tub-thumped in their campaigns, Pickerbaugh merely became angry, and Martin wanted to resign, and saw Irving Watters again, and returned to Pickerbaugh with new zeal, and was in general as agitated and wretched as a young revolutionist discovering the smugness of his leaders.†
Chpt 21

At first he was annoyed by Sondelius's disturbing presence, however interesting he found his fervors about plague-bearing rats (whom Sondelius hated not at all but whom, with loving zeal, he had slaughtered by the million, with a romantic absorption in traps and poison gas).†
Chpt 30