その問題をいいかげんに扱ってはいけない。

that (something or someone distant from the speaker, close to the listener; actions of the listener, or ideas expressed or understood by the listener); the; um...; er...; uh...

question (e.g. on a test); problem; problem (e.g. societal, political); question; issue; subject (e.g. of research); case; matter; question (i.e. doubt); public discussion; controversy; trouble; problem; inconvenience; difficulty

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.

irresponsible; perfunctory; careless; lukewarm; half-baked; halfhearted; vague; reasonable; moderate (usu. in suggestions or orders); considerably; quite; rather; pretty

at (place, time); in; on; during; to (direction, state); toward; into; for (purpose); because of (reason); for; with; by; from; as (i.e. in the role of); per; in; for; a (e.g. "once a month"); and; in addition to; if; although

to deal with (a person); to treat; to handle; to take care of; to entertain; to deal with (a problem); to handle; to manage; to operate (e.g. a machine); to handle; to work; to deal in; to sell; to cover (a topic); to treat; to discuss; to take up; to treat A as B; to mediate (an argument); to be too much for one; to find unmanageable; to gossip

if ... then; when; and; why don't you...?; the more (one does something); because; since